Across
Make up crap about universal truth (11)
Head of oil drilling company gives expression of surprise (3)
Devil's new advanced jolly personality (5)
I haven't cracked this one yet — but Fifteensquared have:
SATA N (devil) with the N (new) advanced within the word to form SA N TA
Hallucinogen obtained from fermented stale dung (9)
Brew ale with subtle colour (9)
Good boss makes soup with okra (5)
Ring Frenchwoman covered in dirt (7)
So long and thanks again (4)
Conservative conned country (4)
Light pollution finally stops after November (7)
I haven't cracked this one yet — but Fifteensquared have:
( N [ last letter of {finally} POLLUTIO N ] contained in [stops] LATER [after]) + N (November is the International Radio Communication codeword for the letter N )
Preside over meeting daily about one (5)
I haven't cracked this one yet — but Fifteensquared have:
CHAR (a cleaner; a daily) containing (about) I (Roman numeral for one)
I don't believe you become celibate? (9)
Frenchman and Scotsman are in a state (9)
Those people initially establish unifying idea (5)
Couple beginning to want closed borders (3)
Transparent form of calcite found in supermarkets (11)
Down
Eccles is upset over American leaving meat in case improper application results (8)
I haven't cracked this one yet — but Fifteensquared have:
MISUSAGE (wrong use; improper application)
Religious female at school reportedly in West Midlands town (8)
I haven't cracked this one yet — but Fifteensquared have:
NUNEATON (market town in Warwickshire; West Midlands town)
Counterfeit pens left in bar (5)
I haven't cracked this one yet — but Fifteensquared have:
FLAKE (reference Cadbury’s chocolate FLAKE ; a chocolate bar)
Man allowed to display garland (7)
I haven't cracked this one yet — but Fifteensquared have:
CHAPLET (garland or wreath for the head)
A French man carries Uniform? That's topical! (7)
I haven't cracked this one yet — but Fifteensquared have:
UNGUENT (ointment; TOPICAL is a term descriptive of an ointment for application to the skin)
I lengthen changes in order to educate (9)
Start of computer game is second-rate (6)
I haven't cracked this one yet — but Fifteensquared have:
CRUMMY (not good; second rate)
Choice of brew with bubble rising (6)
I haven't cracked this one yet — but Fifteensquared have:
OPTION (choice)
Hi I'm Sarah Batty religious sage (9)
DIY ledge on bookcase with rockers hard to lower (8)
I haven't cracked this one yet — but Fifteensquared have:
S H ELF (ledge on a bookcase) + ELP (Emerson, Lake & Palmer, English progressive rock supergroup formed in London in 1970; rockers) with H (hard, when describing pencil lead) being lowered to a place further down the entry to form SELF- H ELP
Caught idiot with flower in Cardigan? (8)
Labour cleared broadcast (7)
Greek character hosts a dance (7)
I haven't cracked this one yet — but Fifteensquared have:
LAMBDA (character of the Greek alphabet) containing (hosts) A
Revolutionary stole coat partly to get fur (6)
Marxist captures state capital (6)
Initially opposed unidentified Tory's extensive dalliances being made public knowledge (5)
I haven't cracked this one yet — but Fifteensquared have:
OUTED ( first letters [initially] of each of O PPOSED, U NIDENTIFIED, T ORY’S, E XTENSIVE and D ALLIANCES)
Type letters or click words in the clue