Across
See 22
Cold capital with extremes of temperature that creates a 19 after change (7)
I haven't cracked this one yet — but Fifteensquared have:
C (cold) + LIMA (capital) + T[emperatur]E – the answer to 19ac is EMERGENCY
A service that's revolutionary at a distance (4)
Confine guy's joint and hand (10)
Endless dirt: it is recurrent, creating baffling problems (6)
Cushion Brown left in Oman, possibly (8)
9 this from recycled plutonium — guards look back, leaving depleted uranium (9)
Expressionist artist's content to get things moving (5)
Charlotte's discrimination shown in a brief device (5)
I haven't cracked this one yet — but Fifteensquared have:
A GISM[o] (a brief device) – I don’t understand the reference to Charlotte: googling produced only information about a recent lecture on agism at Charlotte University but I don’t think that can be it
Crisis with English vehicle missing a crossing over French sea (9)
Fast route from A to B, then regularly dashing around university (8)
I haven't cracked this one yet — but Fifteensquared have:
A TO B + alternate letters of dAsHiNg round U (university)
International, where young woman crosses pitch (6)
Where tourists go to order cava and roast beef starter (5,5)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (to order) of CAVA and ROAST B[eef]
Book character (4)
Dispersing a thing full of energy (7)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (dispersing) of A THING round E (energy), which is doing double duty
Men hate cooking — it contributes to 24 28 (7)
Down
Brighton ref nit-picking — hosts raised hell (7)
Copycat is over neat (5)
Store outside Santander's affirmative bank (7)
Network trouble arising that is hampering society (6)
I haven't cracked this one yet — but Fifteensquared have:
A reversal (arising) of AIL (trouble) + IE (that is) round S (society)
Film the French on strike, a cover for Christmas activities (9)
Rogue that creates revolutions (7)
Male inventor sick about Newton becoming green (13)
I haven't cracked this one yet — but Fifteensquared have:
A clever anagram (sick) of MALE INVENTOR round N (newton, SI unit)
Attack in California city bay, a start to tragedy (4,3,2)
Stick lettuce inside something sweet (7)
Again class note German artist of French extraction (7)
Annoyance of old king hampered by restraint (7)
1a
Battered cod boxed in air or gas (6,7)
Energy zero — not moving! (5)
I haven't cracked this one yet — but Fifteensquared have:
O (zero) + O MPH (not moving)
Type letters or click words in the clue