For the rest, nothing particularly obscure except possibly the fluff one, and for younger solvers the insect repellent. Our older clothes used to rather reek of the stuff in the hope of keeping the moth larvae away.
No less than two entries from the Periodic Table, one of which pairs up with anmther murder mystery poison. No cricket, and no birds. Be grateful for small mercies!
Clues, definitions and SOLUTIONS precede my attempts at explanation.
1 Box used by king and queen containing large diamond? (8)
SPARKLER Box is SPAR, then King provides the K, Queen the ER, and they contain L(arge)
BIGAMY You could argue that the defuinition is just crime, or even which, but I think it makes more sense as a cryptic definition. My news feed tells me that South Africa is currently voting to make polyandry legal in which case two male and one female partner would not be a crime. Polygamy is already legal, though a prominent figure with four wive is kicking up a fuss about women getting such equal rights. Anyway, in the UK, three partners in the same marriage is still a crime.
LOAN A computer network can be a LAN, put 0 in it. Cute definition.
COMPLIMENT A matryoshka clue: L(ine) in P(age) I inside COMMENT for remark
NIGHTSHADE Near is NIGH, followed by an anagram (suspicious) of DEATHS
RIOT Corruption is ROT, and one beset by it is, um, I
HEBRIDES Pelts is one of those useful words for setters with a range of meanings. Here, it's the HIDES version you need, with E(uropean) and BR(itish) contained.
IMPURE Frenchman is M(onsieur), turned up is PU, both placed withing I(ndia) (NATO) and RE for about
FRACAS Another riot of sorts, this time constructed with a reversed (back) SCARF for stole and an inserted A.
NEARSIDE The side of a vehicle nearest the kerb, in Britain notoriously the left. NEAR is a slightly unusual word for mean, or spending little, and squad is in this case a SIDE, or team
SLIM Probably an accurate description of my chances of getting my pink square in the next clue greened, but hope springs. Anyway, S(econd) plus the L that opens lecturer, plus I'M
BACKHANDED So, I put an R at the end, and both versions are listed as tennis strokes (an element of a rally), but only the one with the D is listed as meaning dubious. And ok, the R version is hyphenated in Chambers, though not in other sources. Now, if only I could find someone to dig out a definition that was not just a bribe, but also a backhanded (dubious) comment. I don't suppose anyone wants to help. Either way, it's a double definition.
ENCHANTERS CHANT is a simple melody, plaxced inside ENTERS for records (the verb) On edit. Thanks to Kevin, I've remembered/realised I should have noted that CHAN
MOOR Just ROOM for space backwards.
CHERRY Clamour is CRY, and HER stands in for ship, usually referenced as female. The idea turned up in one of the weekend embargoed puzzles, and was fresh enoough in my mind.
GREEN TEA Green for inexperienced plus TEAm for crew with its last letter denied.
2 Cut-throat businessman favouring tree receiving support (9)
PROFITEER If you favour a tree you may be PRO FIR. Include TEE for support
RANCHER Managed is RAN, and then it's CHEER for encouraging sound minus its "heart", the middle E
LOCUS Copper in chemistry is CU (Cu for purists) placed in a reversed (turning up) SOL for Sun
RUM As easy as they come: M(illion) follows Rugby Union, RU.
BALLERINA Let's call this a rather neat &lit. A passion rising is AN IRE backwards, following (in pursuit of) BALL for dance
GUMDROP Size is also "a weak glue...for preparing walls before plastering or wallpapering" (Chambers). So GUM. Add DROP for reduce.
MANGO Piece as in chess for example gives MAN, add half of GOod.
ARSENIC More chemistry, if a bit sneakier this time. An angram (rocks) of NICE AS plus R(iver)
DUST BUNNY "A ball of dust and fluff (North American informal)". I was vaguely but sufficiently aware of the term as I put an anagram (sadly) of BUST inside a Victorian (Australian) loo, which is a DUNNY.
RIDGEPOLE Head of Government G placed in RIDE for trip, plus a random and convenient European, a POLE
CAMPHOR One of its uses. Affected: CAMP and your wasp is a HORNET. Steal its NET
SANDMAN A bit of lateral thinking here. The odd couple in SoMe is S AND M. Add an article, an AN
LUNCH A promotional event might be a LAUNCH. If you don't provide the A it becomes...
HASTE HAS for retains plus the first letters (openings) of Trainee Explorers.
EGG Well, at least sometimes. For one gives EG, and Guest at the outset is, um, G.