Across:
8 Patrick isn’t part of practical joke (‘Patrick’ isn’t part of ‘practical joke’ = caljoe = CAJOLE) or sweet talk (CAJOLE),
9 One of the numbers (AIR) for (FOR-) church (Church of England = -CE) (AIR FORCE) service (AIR FORCE),
10 Covered up by Yuppie Disease (covered up by ‘yuppiE DISease’ = edis = SIDE) on part of The Square (on part of the square = SIDE),
11 In need of a map (LOST) for The Bertie Bowl? (GROUND) (LOST GROUND) If that’s the case, I’ll have to make it up! (if I’ve LOST GROUND, I’ll have to make it up),
12 Retort from demonstrator (‘retort’ from ‘demonstrator’ = dmnsao = DAMSON) in a jam (DAMSON),
14 Weekend (‘weeK’ end = -K) runabout (car = CAR-) in Ring (ring = wedding band = BAN- -D) (BANK CARD) is swiped by sales assistant in payment (BANK CARD),
15 Dropping a line (dropping a fishing line = CASTING) to one of those on The Board (DIRECTOR) (CASTING DIRECTOR) – the one picking the players (CASTING DIRECTOR),
18 Dressing (POULTICE) it (it) up (= reverse indicator) (it = -TI-) in Odd (= anagram indicator) Couple (couple = POUL-CE) (POULTICE),
20 Sets up (= reverse indicator) agency (CIA = -A-IC) introducing the French (le = -EL-) to golf (G-) (GAELIC) – a very Irish Sport? (GAELIC),
22 Oddball (= anagram indicator) farmer (farmer = -ERMAFR-) consumed by tweet (tweet = P-OST) (PERMAFROST) is unlikely to ever thaw out (PERMAFROST),
24 Set off strikes (‘set’ off ‘strikes’ = riks = RISK) with uncertainty (RISK),
25 Don’s role (dons role) playing (= anagram indicator) (dons role = OLD NORSE) Medieval Scandinavian (Medieval Scandinavian = OLD NORSE),
26 Provide cover for (ASSURE) foolish type (ASS-) heading off (c) for smoke (‘cure ‘ without ‘c’ = -URE) (ASSURE).
Down:
1 Criminal (= anagram indicator) avails (avails = SALIVA) of what mouthy type produces (SALIVA),
2 Supporting Elbow, for example (BONE), performing (-ON-) in Belgium (Be = B-E) (BONE),
3 Covers (BED LINEN) for border (BED) and row (LINE-) is new (new = -N) (BED LINEN),
4 Limits (CAPS) borders of cash crops (for borders of ‘CAsh croPS’ = CAPS),
5 State (OREGON) of tuba from Baton Rouge (‘tuba’ from ‘Baton Rouge’ = onroge = OREGON),
6 Recalls (= reverse indicator) study (room = MO-OR) about the end of Velvet (the end of ‘velveT’ = -T-) Revolution (CYCLE) (MOTORCYCLE) – the one that came with a rider (MOTORCYCLE),
7 Cornea is (cornea is) damaged? (= anagram indicator) (cornea is = SCENARIO) One of those in theatre outlined this possibility! (SCENARIO),
13 Avoid a court appearance (SETTLE-) with workers (-MEN-) heading for trial (heading for ‘Trial’ = -T) (SETTLEMENT) in colony (SETTLEMENT),
14 Slightly move (BUDGE), for example (e.g.), one of those from the capital (Dub) going all the way back (= reverse all indicator) (eg = -GE + Dub = BUD-) (BUDGE).
16 Bachelor (BA = AB-) backs (= reversal indicator) topless (c) bathing area (‘cove’ without ‘c’ = -OVE) for everyone (ALL) (ABOVE ALL) in a heavenly location (ABOVE ALL),
17 Targets a (targets a) swimming (= anagram indicator) (targets a = REGATTAS) series of contests on the water (REGATTAS),
19 Give away (INFORM) Vogue (IN-) questionnaire (questionnaire = -FORM) (INFORM),
21 Inspector dismisses cop (‘inspector’ dismisses ‘cop’ = insetr = INSERT) from Lodge (lodge/ INSERT),
23 Range (OVEN) and backing (= reverse indicator) content of one voice (content of ‘oNE VOice’ = nevo = OVEN),
24 Sides of ricotta cheese (sides of ‘RIcotta cheeSE’ = RISE) react to yeast (RISE).