Across:
1 Constabulary withdraws bounty (‘constabulary’ withdraws ‘bounty’ = csalar = RASCAL) for cheeky chappie (RASCAL),
4 Tolka Park perhaps (CLUB LAND) is for the hoofers? (CLUBLAND),
9 Relative (AUNTIE) of American (A-) set free (-UNTIE) (AUNTIE),
10 Created (= anagram indicator) Crusades (crusades = USED CARS) with old modes of transport (USED CARS),
12 At the end of 1 down (end of ‘road maps’ = maps), for the most part (s) (‘maps’ without ‘s’ = MAP-), the foreign (the = -LE) page in the book (LEAF) (MAPLE LEAF) is symbolic to the Canadians (MAPLE LEAF),
13 One of the cutbacks (PRUNE) in Trim? (trim = PRUNE),
14 Spike (POINT) and Oscar (O-) Furlong (-F) heard this from the judge (ORDER) (POINT OF ORDER) querying what’s said in The House (POINT OF ORDER),
18 From a haematological perspective, no mature DNA found in this vessel (RED BLOOD CELL) or crimson (RED) family (BLOOD) mobile in New York (mobile phone = CELL phone in US) (RED BLOOD CELL),
21 Flows out (POURS) of prose from Prosperous (‘prose’ from ‘prosperous’ = prous = POURS),
22 Methuselah (OLD FELLOW) got a job in a college as far back as anyone can remember (OLD FELLOW),
24 Paint a picture of (DESCRIBE) date (D-) with English (-E-) writer (-SCRIBE) (DESCRIBE),
25 Turns up (= reversal indicator), genetic evidence (DNA = -AND) found on top of the ground (top of ground = -G-) in Australia (AU = U-A) (UGANDA) and in Africa (UGANDA),
26 Church caretaker (verger) is not finished (r) (‘verger’ without ‘r’ = verge = ROADSIDE) by the way (ROADSIDE),
27 Open letter dismisses plot (‘open letter’ dismisses ‘plot’ = eneter = ENTRÉE), of course (ENTRÉE).
Down:
1 Political plans perhaps (ROAD MAPS) for pro-Adams (pro-Adams) shift (= anagram indicator) (pro-Adams = ROAD MAPS),
2 Small (S-) horse (pony) – Boomerang’s (= reversal indicator) (pony = -YNOP-) relative (-SIS), (SYNOPSIS) in summary (SYNOPSIS),
3 Light-footed (AGILE) barman (Attorney General = AG-) loses tip (f) in row (row/line = ‘file’ without ‘f’ = -ILE) (AGILE),
5 Dumbstruck (LOST FOR WORDS) – this is what happens when someone steals your dictionary (LOST FOR WORDS),
6 Bard’s deep (bards deep) problem (= anagram indicator) (bards deep = BEDSPREAD) extends over The Queen (BEDSPREAD),
7 A (A-) graduate (-BA-) getting to use profanity (cuss) briefly? (s) (‘cuss’ without ‘s’ = -CUS) (ABACUS) You can count on it! (ABACUS),
8 Friend of dancer (reindeer DASHER friend of reindeer Dancer) is a fast mover (DASHER),
11 Narcissist’s obsession (SELF-) with Digest (-ABSORB-) writer (-ED) (SELF-ABSORBED) of “Mé Féiner” (SELF-ABSORBED),
15 Cherishes (TREASURES) rare set (rare set) built (= anagram indicator) (rare set = TREA-RES) around backward America (US = -SU-) (TREASURES),
16 German (BERLINER) short (e) story (‘lie’ without ‘e’ = -LI-) set in European capital (capital of Switzerland = Berne = BER-NE-) at the end of winter (at the end of ‘winteR’ = -R) (BERLINER),
17 Is lethargic (SLOW) on the athletics course (LANE) (SLOW LANE) in the inside track perhaps (SLOW LANE),
19 Old man gets out of Promised Land (‘old man’ gets out of ‘Promised Land’ = prised = SPIDER) – you can see it on The Web (SPIDER),
20 Most of (h) Dublin seaside town (‘Rush’ without ‘h’ = RUS-) school (-S-) returning (= reversal indicator) first class (A1 = -IA) (RUSSIA) from the country (RUSSIA),
23 Encourage (EGG ON) suits to leave suggestion (‘suits’ to leave ‘suggestion’ = ggeon = EGG ON).