Fifteensquared

A pleasing challenge from Aardvark today with some nicely misleading clues and a few interesting indicators, for example ‘aperitifs’ and ‘evolution’. 6d had me looking for an anagram of ‘at her holiday inn’ for a while until the penny dropped and I rather liked 3d even though the answer was obvious. 

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Across
1 WHIMBREL  WHIM (fancy) BR (British) EL (the, in Spanish) – a species of small curlew
5 SHUT UP  HUT (shed) U (uniform) in SP (special)
10 AD-LIB  A[my's] D[inner] LIB (party)
11 IONIAN SEA  hidden in ‘seclusION IANS EAsily’
12 SIMULATOR  LA (US city) in *(TOURISM)
13 TIARA  AI (high-class) in ART (technique) reversed
14 ABLAZE  A[nkle] B (black) LAZE (sit around)
15 EURASIA  A [f]I[e]S[t]A RUE (French way) reversed
18 ADDED UP  [p]ADDED UP (prepared to bat without opener)
20 CRAGGY  C (colt) A GG (a horse) in RY (tracks)
22 BAR-B-Q  BARB (a taunting) Q (question)
24 DIAPHRAGM  H (hospital) in *(RAPID) AGM (meeting)
25 IN THE PINK  dd
26 TAUNT  TAUNT[on] (somewhere in Somerset, not working)
27 EUREKA  K[os] in E (electronic) UREA (waste)
28 DROLLERY  ROLL (rumble) E[dinburgh] in DRY (deadpan)

Down
1 WRASSE  W[ate]R ASS (carrier) [accommodat]E
2 ISLAMABAD  MAL (bad, in French) reversed in ISA (investment) BAD (poor)
3 BUBBLE AND SQUEAK  dd
4 EPISTLE  *(P[a]LESTI[n]E)
6 HEARTBREAK HOTEL  *(AT HER) BREAK (holiday) HOTEL (inn)
7 TOSCA  hidden reversal in ‘isaAC SO Talented’
8 PLAY AWAY  dd
9 ENTREE  EN (nurse) TREE (bay)
16 SIGNATURE  *(GIANT) in SURE (certain)
17 BARBWIRE  BAR (pub) B (second-rate) WIRE (telegraph)
19 PIDGIN  DIP (lower) reversed GIN (booze)
20 CRACKER  RACK (cut of meat) in REC (recipe) reversed
21 SMITHY  MIT (with, in German) in SHY (embarrassed)
23 ROTOR  cd