Across:
8 Express disapproval (boo = B-OO) over a (-A-) doctor (-MB-) (BAMBOO) offering grass (BAMBOO),
9 Violent disturbance (UPHEAVAL) in university (University of Limerick = U-L) over pressure (-P-) and endless heat (endless ‘heat’ = -HEA-) on Virginia (-VA-) (UPHEAVAL),
10 Partner (MATE) consumed by amphetamines (consumed by ‘amphetamines’ = etam) doing the rounds (= reversal indicator) (etam = MATE),
11 15 across starts (starts ‘break out in a rash’ = BREAK) with release (LOOSE) (BREAK LOOSE) produced by Free (BREAK LOOSE),
12 Pole (pole = -EOPL-) running (= anagram indicator) in gym (PE = P-E) (PEOPLE) race (PEOPLE),
14 Labour (-WORK) lawyer takes it (CASE-) from the start (= positional indicator) (CASEWORK) – Social Services should be dealing with it (CASEWORK)
15 Most of 21 down (most ‘breaks’ = BREAK) on holiday (OUT) at popular (IN) American (A) spots (RASH) (BREAK OUT IN A RASH) had an allergic reaction (BREAK OUT IN A RASH),
18 German (BAVARIAN) voices introduce (‘voices’ introduce = -V-) bit of Puccini, for example (-ARIA-), in bar (BA-N) (BAVARIAN),
20 Don’t stop (PASS BY) for free ticket (PASS) for heartless (o) lad (‘boy’ without ‘o’ = BY) (PASS BY),
22 Scrutinize (CHECK-) the most important fact (-POINT) (CHECKPOINT) produced by Charlie in old Berlin (CHECKPOINT Charlie),
24 Frank (OPEN) is in part of Copenhagen (is in part of ‘Copenhagen’ = OPEN),
25 Report (BULLETIN) of university (University of Limerick = -UL-) accommodation (-LET-) in storage site (B-IN) (BULLETIN),
26 A shot of the swingers (a shot of the golfers = STROKE) witnessed in 24 across (STROKE witness in golf ‘open’).
Down:
1 Animal (SAVAGE) left (l) out of rescue (‘salvage’ without ‘l’ = SAVAGE),
2 Qualified (ABLE) to remove art from Alberta (to remove “art” from “Alberta” = lbea = ABLE),
3 Grave (SOMBRE-) exchange of words (row) isn’t finished (w) (‘row’ without ‘w’ = -RO) (SOMBRERO) for one hiding from The Sun (SOMBRERO),
4 Uncle Sam releases scan (‘Uncle Sam’ releases ‘scan’ = ulem = MULE) of drugs smuggler (MULE),
5 Ship (S-S) full of fish (-HAKE-) (SHAKES) sways from side to side (SHAKES),
6 Those dropping a line might want them (CAN OF WORMS) to open up – there’s more trouble to follow (open up a CAN OF WORMS),
7 Presumably they’ll have to face the music (MAESTROS) for Article (-A-) in Metro’s (Metro’s = M-ESTRO-) spread (= anagram indicator) with scathing introduction (‘scathing’ introduction = -S) (MAESTROS),
13 Exercise on the piano (PLAY A SCALE) beaches in Barcelona (Playas = PLAY A S-) with cold (-C-) beer (-ALE) (PLAY A SCALE),
14 Copper (CU-) can (tin = -T-IN) (CUT IN) switch lanes on the road dangerously (CUT IN),
16 Extend a hand to (REACH OUT) leaders of evacuated army compromised (leaders of ‘evacuated army compromised’ = -EAC-) by hothead (‘hot’ head = -H) in rout (R- OUT) (REACH OUT),
17 Turns up (= reversal indicator), American college (Massachusetts Institute of Technology= MIT = -TI-M) admits school (-S-) is accessible to everyone (open = NEPO-) (NEPOTISM) looking after their own family (NEPOTISM),
19 Feeds into (INPUTS) Putin’s (Putins = INPUTS) madness (= anagram indicator),
21 Snaps (BREAKS) from the holidays (BREAKS),
23 No guilt in insulting (no ‘guilt’ in ‘insulting’ = insn = INNS) public houses (INNS),
24 Part of backlog repudiated (part of ‘backlog repudiated’ = OGRE) by pantomime villain (OGRE).