Across
Sit once more in tranquillity (6)
Palace player going too far in a large undergarment (8)
I haven't cracked this one yet — but Fifteensquared have:
HAM(a player on stage, specifically one who overacts/is going too far) contained in ( in ) [ A +L(abbrev. for “large”) + BRA(short for brassiere, the undergarment) ].
News about cycle of regularly fabricated material (5)
I haven't cracked this one yet — but Fifteensquared have:
N,N(twice the abbrev. for “new”) containing ( about ) 2nd, 4th and 6th letters of ( … regularly ) “ cycle of “.
Boss losing face in dog-tired state (9)
I haven't cracked this one yet — but Fifteensquared have:
“stud”(boss/a projecting knob in the centre of a shield) minus its 1st letter ( losing face ) contained in ( in ) LASSIE(the fictional canine character).
Slides, as with sliding rocks (9)
Pirouetting priest in party is slippery (5)
I haven't cracked this one yet — but Fifteensquared have:
Reversal of ( Pirouetting ) [ ELI(Biblical priest) contained in ( in ) DO(a party/a social function) ].
Business that's going to set up partnerships? (6,6)
The Met Office? (8,4)
Divine Greek female and Frenchman on island (5)
I haven't cracked this one yet — but Fifteensquared have:
RENÉ(a typical Frenchman’s name) placed after ( on ) I(abbrev. for “island”).
Person to copy European-style bread sandwiches (4,5)
I haven't cracked this one yet — but Fifteensquared have:
[ E(abbrev. for “European”) + MODE(a style/manner in which something is done) ] contained in ( … sandwiches ) ROLL(a very small loaf of bread).
Time off saved duty at work (5,4)
Versifier performed in recital (5)
Legal authorities excluding one sign (8)
A second tie put on where actors perform (6)
Down
Study absorbing info about English traitor (8)
I haven't cracked this one yet — but Fifteensquared have:
[ READ(to study a subject, say, at a university) containing ( absorbing ) reversal of ( … about ) GEN(information) ] + E(abbrev. for “English”).
Alleviate pressure on my total earlier food intake (8)
I haven't cracked this one yet — but Fifteensquared have:
P(symbol for “pressure” in physics) placed above ( on , in a down clue) [ALL I ATE](my total earlier food intake/all that I had eaten).
Rising stars around independent channel (5)
I haven't cracked this one yet — but Fifteensquared have:
Reversal of ( Rising , in a down clue) SUNS(stars in the universe, like our own) containing ( around ) I(abbrev. for “Independent”, the newspaper, or one not belonging to any political party).
Liberals seem upset by society's work on injustice (3,10)
Do I take drug, on turning up to get some protein? (5,4)
I haven't cracked this one yet — but Fifteensquared have:
{ [AM I …?](do I …?) ON(take/use) ACID(short for LSD, a hallucinogenic drug) } with reversal of ( … turning up , in a down clue) its “ON”.
Canadian songster scoffing a trifle (6)
I haven't cracked this one yet — but Fifteensquared have:
BUBLÉ(Michael, Canadian singer and songwriter) containing ( scoffing ) A .
See 18
Scandal involving royal house making bit of capital (9,4)
What makes middle of cell right after fresh clean out (9)
Cleric rejected papers cutting about sex (8)
I haven't cracked this one yet — but Fifteensquared have:
Reversal of ( rejected ) ID(identification papers) contained in ( cutting ) CARNAL(about sex/pertaining to physical sexual needs and activities).
Praise dropping a train network for non-union shenanigans (8)
I haven't cracked this one yet — but Fifteensquared have:
“adulate”(to praise/to idolise) minus ( dropping ) “ A ” + RY(abbrev. for “railway”/train network).
8d
Feature of Copenhagen — Danish design kept secret (6,6)
Olivier periodically dressed in check cloth (6)
I haven't cracked this one yet — but Fifteensquared have:
2nd, 4th and 6th letters of ( … periodically ) “ Olivier ” contained in ( dressed in ) VET(to check/to screen).
For example, stupid flipping sucker! (5)
I haven't cracked this one yet — but Fifteensquared have:
Reversal of ( … flipping ) [ EG(abbrev. for “exempli gratia”/for example) + DIM(stupid/dense) ].
Type letters or click words in the clue