Times crosswords don't get much more straightforward than this. Indeed, I was able to rack up my third in a week under 30 minutes (including Saturday's), so expect PBs and possibly clean sweeps from under the Heathrow flight path. 19 minutes.
1 IBIS - hidden.
9 MARGINALIA - alarming* + I + A.
10 D+RUM - kitchen as in percussion section of the orchestra.
11 UNFAIR - [f]UNFAIR.
12 COMEDOWN - COMED[y] + OWN (idio comes from the Greek word meaning 'own').
14 MENU - MEN + [q]U[een].
15 LACHRYMOSE - carol my she*
17 ASCENDANCY - dances can* + [traged]Y.
20 TOME - TOM (as in Tom, Dick and Harry) + E.
21 FRAGRANT - FRA (title given to Italian monk or friar; short for frate) + GRANT.
23 BE+HIND - responsible for as in 'The woman was behind it'.
24 ANON - [europe]AN + ON (playing).
25 TABLECLOTH - TABLE (move, as in a motion) + CLOT (mug; silly fellow) + H[arm].
26 CONVERSELY - CONVERSE + L + [tor]Y.
27 YARD - RAY reversed + D[rink].
2 BRAINTEASER - bar trainees*.
3 SIGNATURE - IS reversed + G + NATURE ( as in 'She's got a lovely make-up').
4 TENDRIL - NET reversed + DRIL[l].
5 POLICE CONSTABLE - OP reversed - would you believe? - + LICE + CONSTABLE (of Haywain fame).
6 SPAMMER - SPAM + MER[ely].
7 TORSO - TOR + [i]S + O.
9 ROMAN - R[uns] + OMAN for the type of lettering.
15 WESTMINSTER - W[ith] + E + ST + MINSTER.
16 MATCH PLAY - MATCH (light, as in 'Gis a light, mate') + P + LAY.
18 D[RAFT]ER - raft as in loads of stuff.
19 YOBBERY - Y + [r]OBBERY.
22 ADORN - A + DO (as in discharge one's duties) + RN.