Across:
8 Gym work (PE-) for prop (-SET-) taking advantage (-A) (PESETA) of old European capital (capital/money = PESETA),
9 All that remains (SKELETON) of a rough draft, in a writing sense (SKELETON),
10 Stable (FIRM) is unlikely to make a move as it’s not yielding (FIRM),
11 Damages reputation of (DISCREDITS) detectives (detectives = DI’s = DIS-) seen at the end of film (-CREDITS) (DISCREDITS),
12 Pressure (P-) to mysteriously (= anagram indicator) elope (elope = EOPLE) (PEOPLE) with men and women (PEOPLE),
14 Linguistic code (NOTATION) produced by good books (Old Testament = -OT-) in Ireland, for one (nation = N-ATION) (NOTATION),
15 Has a bad reaction (BREAK OUT IN A RASH) to escape from prison (breakout = BREAK OUT) up (= reversal indicator) north (NI = IN) that’s initially audacious (initially ‘audacious’ = A) and reckless (RASH) (BREAK OUT IN A RASH),
18 Relatives (sons = S-ONS) collecting rubbish (-TAT-) on island (-I-) (STATIONS) stops along the way (STATIONS),
20 In a curious way (NOSILY), is only (is only = NOSILY) showing off (= anagram indicator),
22 To help out (CONTRIBUTE) criminal (CON-) with expression of praise in statement (-TRIBUTE) (CONTRIBUTE),
24 Fragment of window notice (fragment of ‘window notice’ = dow n = DOWN) for those low in spirits (DOWN),
25 Came (CAM-E) across vehicle (limo = - OMIL-) set up (= reversal indicator) (CAMOMILE) for the tea (CAMOMILE tea),
26 Part of the diagnosis terrified (part of the ‘diagnosis terrified’ = sis ter = SISTER) one of the family members (SISTER).
Down:
1 Right (R-) time (-T-) in the country (Eire = -E-IRE) (RETIRE) to hang up the boots (RETIRE),
2 Mentor’s son leaves (‘mentors’ son leaves/ without ‘son’ = metr = TERM) for an academic period (TERM),
3 Diagnose (diagnose = SAN DIEGO) disorder (= anagram indicator) on west coast of America (SAN DIEGO),
4 Questions (ASKS) things to do (tasks) off the top of the head (t) (‘tasks‘ without ‘t’ = ASKS),
5 Clandestine (SECRET) group (S-ET) admits backing (= reversal indicator) church (Church of England = CE = -EC-) writing (from the 3Rs = -R-) (SECRET),
6 New jobs (STARTS) finally (= position indicator) for principal (HEAD) (HEAD STARTS) offering competitive advantages (HEAD STARTS),
7 Faulty (= anagram indicator) piston or (piston or = PORTIONS) sections (PORTIONS),
13 Left (L) worker (-ANT-) in courtyard (P-ATIO-) beside fitness centre (‘fitness’ centre = L) (PLANTATION) in country estate (PLANTATION),
14 Takes cognisance of (NOTES) some upsetting (= reversal indicator) character’s loose tongue (some characters ‘loose tongue’ = se ton = NOTES),
16 Criminal (= anagram indicator) on trial (on trial = RATION-L) over a (-A-) (RATIONAL) judicious type (RATIONAL),
17 Nurture or nature? For starters (‘nurture or nature’ for starters = NON-), the feeling is (-SENSE) (NONSENSE) this is rubbish (NONSENSE),
19 Where it begins (ORIGIN) to root (ORIGIN),
21 Women (-W-) in early (early = LA-YER) settlement (= anagram indicator) (LAWYER) up in front of the judge (LAWYER),
23 Employed (USED) supposedly to remove polyps (‘supposedly’ to remove ‘polyps’ = sued = USED),
24 Unhappy (sad = DAS-) retiring (= reversal indicator) from hotel (-H) (DASH) in Rush (rush/hurry = DASH).