Across:
8 What the butcher is selling (TONGUE) with boar from Baton Rouge (‘boar’ from ‘Baton Rouge’ = tnouge = TONGUE),
9 Kneels (kneels = SKELE-N) excited (= anagram indicator) over bone (-T- bone) from duck (-O-) (SKELETON) found in archaeological site (SKELETON),
10 Count’s (counts = ADDS) men leave demands (‘men’ leave ‘demands’ = dads = ADDS),
11 Simple (ELEMENTARY) place in Dublin (Ely Place = EL-Y) accommodating English (-E-) soldiers (-MEN-) from boat (sailor = -TAR-) (ELEMENTARY),
12 Dublin (D-) flower (flower = -RIVER) (DRIVER) club (DRIVER golf club),
14 Tracks (CIRCUITS) where those acting the clown are (CIRCU-S) by ringing the tech team (information technology = -IT-) (CIRCUITS),
15 21 down (‘health’ = HEALTH) is on the cover (INSURANCE) (HEALTH INSURANCE) of The Supplement one gets in case one gets sick (HEALTH INSURANCE),
18 Play charades (M-IME) around neat (neat = -EANT-) set (= anagram indicator) (MEANTIME) in the interval (MEANTIME),
20 Easily annoyed (TETCHY) city father dismisses fair (“city father” dismisses “fair” = ctythe = TETCHY),
22 Brings in (MAKE -S) about a (A-) million (-M-) from wind-up (-END-) (MAKE AMENDS) to compensate for the mistakes (MAKE AMENDS),
24 Some crave a lamb (some ‘crave a lamb’ = VEAL) chop from the butchers (VEAL),
25 Bordeaux (CLAR-ET) embraces fashionable (-IN-) (CLARINET) instrument (CLARINET),
26 Physical substance (ENTITY) provides energy (E-) for little singer (-TIT-) in American city (New York = -N-Y) (ENTITY).
Down:
1 What you have when all the dust has settled (POWDER) for departmental head (‘departmental’ head = -D-) in authority (POW-ER) (POWDER),
2 Broody Sultan produces them (broody Sultan = type of chicken produces EGGS) for horse (-GG-) in point-to-point (east + south = E-S) (EGGS),
3 Groundwork (RESEARCH) for showing off (= anagram indicator) cars here (car here = RESEARCH),
4 Pay off Paisley (‘pay’ off ‘Paisley’ = isle = ISLE) – it’s key (key/low-lying island = ISLE),
5 Decorative mask (VENEER) for disguise? (VENEER),
6 Truants are (truants are = RESTAURANT) hiding (= anagram indicator) in canteen (RESTAURANT),
7 Reviews (= reversal indicator) Channel Island (CI = -IC) actors (actors = SOCRAT-) playing (= anagram indicator) (SOCRATIC) in A Philosophical Method (SOCRATIC),
13 Louvre sent (Louvre sent = VOLUNTEERS) out (= anagram indicator) for people offering to help (VOLUNTEERS),
14 Al Capone dismisses pal (‘Al Capone’ dismisses ‘pal’ = acone = CANOE) as a crafty type who’ll send you down the river (CANOE),
16 Takes a look locally (EYEBALLS) in tight (= anagram indicator) alleys (alleys = EY-ALLS) around rebellious (= reversal indicator) Belgium (BE = -EB-) (EYEBALLS),
17 A foreign (a = UN-) trial (-TEST-) journalist (-ED) (UNTESTED) has not been through the hoops (UNTESTED),
19 Adores getting out of misdemeanour (‘adores’ getting out of ‘misdemeanour’ = miemnu = IMMUNE) and is presumably protected? (IMMUNE),
21 Condition (HEALTH) of Moor (moor = HEA-TH) going around lost (-L-) (HEALTH),
23 You need to get this from your parents if you’ve missed class (NOTE) with some piano teacher (some ‘piano teacher’ = NOTE),
24 Put a stop to the proposal (VETO) in native tongue (in ‘native tongue’ = VETO).