Across
19d
Entertained by situation, you reportedly saw compilers in stadium (6,7)
See 1
Giving notice of rebellion on Instagram? (9)
I see leader of maquis in charge of resistance units (5)
I haven't cracked this one yet — but Fifteensquared have:
OH ("I see") + [ leader of ] M (aquis) + IC (in charge)
Base sent back American troops one's put in the rear (5)
I haven't cracked this one yet — but Fifteensquared have:
E (logarithmic "base") + [ sent back ] <=(A (American) + MEN ("troops") )
Trash lies scattered behind London attraction (9)
I haven't cracked this one yet — but Fifteensquared have:
*(lies) [anag: scattered ] behind V AND A (Victoria and Albert Museum, so "London attraction")
Dim kind of family initially delayed (7)
I haven't cracked this one yet — but Fifteensquared have:
(N)UCLEAR ("kind of family") with its initial delayed becomes U(N)CLEAR
A winning song for one who might sing a lullaby (2,4)
Great cook's equipment – mine comes from the east (3-3)
I haven't cracked this one yet — but Fifteensquared have:
<=(POT ("cook's equipment") + PIT ("mine"), comes from the east, i.e. from right to left) )
Might such rhetoric be no great shakes? (7)
When circling, wild monster is concerning (2,5,2)
I haven't cracked this one yet — but Fifteensquared have:
IF ("when") circling *(monster) [anag: wild ]
Antipathetic sort scoffed, introduced to personnel (5)
National newspaper runs article accompanying TV panel show (5)
Director of Chekhov, one receiving new bits of information (9)
I haven't cracked this one yet — but Fifteensquared have:
ANTON (Chekhov) + I receiving N (new) + I/O (in computing, input/output, so "bits of information") Michelangelo Antonioni (1912-2007) was an Italian film director, whose most famous movies were probably L'Avventura, L'Eclisse and Blow-Up.
29a
Boy who upset girls, say, turned quiet in endless, wild parties repeatedly (7,6)
See 28
Down
Supply thé and café au lait for French drink supplier (7,6)
Asian ready to use the bathroom after sport (5)
Like certain atoms in air probed by a learner after university (9)
I haven't cracked this one yet — but Fifteensquared have:
A + L (learner) in VENT ("air") after UNI (university)
Kid's utterance, eating chap's plum (7)
Zulu's close relative has ox to transport (5)
Writer of top spy book upset about bloomer (9)
I haven't cracked this one yet — but Fifteensquared have:
M ("top spy" in Bond novels) + <=TOME ("book", upset) about IRIS ("bloomer")
20d
Spies dry, gnarled trees by river with very frozen water (6,7)
21d
What optimists seek – or what we will need to make wage? (6,6)
Ronaldo's current, boring antics or fooling around (9)
I haven't cracked this one yet — but Fifteensquared have:
I (electrical "current") boring *(antics or) [anag: fooling around ]
Get on with horse, stifling feeling of irritation (5,4)
Extract personal info about father when hosting son (7)
I haven't cracked this one yet — but Fifteensquared have:
PA'S AGE ("personal info about father") when hosting S (son)
See 1
See 7
See 8
Feeling contrite about calamity? Good! (5)
Crowd booting out king? This shows a lot of cheek (5)
Type letters or click words in the clue