Across:
1 One of the Greens (pea = PE-A) possesses place (-SET-) (PESETA) in old European capital (capital/money = PESETA),
4 In favour of (FOR-) going to Clare (-CE) on holiday? (OUT) (FORCE OUT) Drive people from the house! (FORCE OUT),
9 Soldier (RANGER) in regiment (R-) from Red State? (-ANGER) (RANGER),
10 Accepted (OFFICIAL) no threat in article of faith (no ‘threat’ in ‘article of faith’ = icloffai = OFFICIAL),
12 Do damage in the column (SLIP A DISC) by mistake (SLIP) and primarily (‘And’ primarily = A) going on the record (DISC) (SLIP A DISC),
13 Al Capone dismisses pal (‘Al Capone’ dismisses ‘pal’ = acone = CANOE) as a crafty type capable of sending you down the river (CANOE),
14 Whatever you say, say nothing (TALK TO NOBODY) opening 18 across (opening ‘talk nonsense’ = TALK) and not (not) retiring (= reverse indicator) (not = TO N-) with old (-O-) soul mate (-BODY and soul) (TALK TO NOBODY),
18 Chew the fat (TALK), tripe (NONSENSE) (TALK NONSENSE) and rabbit, like a fool (rabbit like a fool = TALK NONSENSE),
21 Six-footer removes roof (‘six footer’ removes ‘roof’ = sixte = EXITS) leaves (EXITS),
22 The foreign (French ‘the’ = LA-) weekend (‘weeK’ end = -K-) at the end of June (end of ‘junE’ = -E) near 23 down (‘Garda’ = GARDA) (LAKE GARDA) and a large body of water in Italy (LAKE GARDA),
24 Confess (TALK) to extreme (‘tO’ extreme = O-), rebellious (= reverse indicator) priest (Rev = -VER) (TALK OVER) – discuss! (TALK OVER),
25 A (-A-) father (Parish Priest = -PP-) in love in Ireland (Irish ‘love’ = grá = GR-A) (GRAPPA) is drunk in 22 across, for example (GRAPPA drunk in ‘Lake Garda’)
26 The end of 18 across? (end of ‘talk nonsense’ = NONSENSE) That’s blarney! (NONSENSE),
27 Some initially (‘Some’ initially = S-) confuse (-ADDLE) (SADDLE) the sheepish type’s joint (SADDLE of lamb/sheepish type’s joint).
Down:
1 Sounds like (= homophone indicator) somewhere one could find jumpy characters (“para site” = “PARASITE”) – one living off the other (PARASITE),
2 One (-I-) lawyer (-BL-) in Essen (Essen) drunk (= anagram indicator) (Essen = SENS-E) (SENSIBLE) or sober, in a practical way? (SENSIBLE),
3 Central actor (central ‘acTor’ = -T-) in Heat (heat) adapted (= anagram indicator) (heat = THE-A) (THETA) for a Greek character? (THETA),
5 Political group (bloc) heard (= homophone indicator) (‘bloc’ = ‘block’ = BLOCK-) in workplaces (offices = OFFICE -S) (OFFICE BLOCKS) or commercial buildings (OFFICE BLOCKS),
6 Is in agreement with (COINCIDES) papers (-ID-) in concise (concise) order (= anagram indicator) (concise = COINC-ES) (COINCIDES),
7 Roman emperor (Nero = OR-EN-) goes back (= reversal indicator) around island (-I-) near Troy (-T) (ORIENT) in the East (ORIENT),
8 Might have a lot to say (TALKER) to half the characters in 24 across (half of ‘talk over’ = TALK-) joining Oriental (East = -E-) regiment (-R) (TALKER),
11 Jack and David (Jack the Giant killer and King David killed Goliath = GIANT KILLERS) huge (GIANT) in Kildare (KILL-) and sick in hospitals (ERs = -ERS) (GIANT KILLERS),
15 Coaches (trains) dropping one (i) (‘trains’ dropping ‘i’ = TRANS-) model (-POSE) (TRANSPOSE) substitute (TRANSPOSE),
16 One (I-) Pinter (Pinter = -NTREPI-) play (= anagram indicator) directed (-D) (INTREPID) by fearless type (INTREPID),
17 Looks up (= reversal indicator) primates (apes = SEPA-) and judge (-RATE) (SEPARATE) in Split (SEPARATE),
19 Steel band dropping LSD (‘steel band’ dropping ‘LSD’ = teeban = BEATEN) didn’t win the competition (BEATEN),
20 Fiddle (VIOLIN) oil (oil) production (= anagram indicator) (oil = -OLI-) in Bordeaux, for example, according to the French (Bordeaux ‘wine’ = vin = VI-N) (VIOLIN),
23 A (-A) Yank (yank/pull = drag) retires (= reverse indicator) (drag = -GARD-) (GARDA) from working in the police force (GARDA).