Across
Monsters mostly guzzle on bison’s heart (7)
I haven't cracked this one yet — but Fifteensquared have:
[ mostly ] GORG (e) ("guzzle") + ON + (bi) S (on) [ 's heart ]
Enthusiastic display of half-time pies and Bovril? (7)
I haven't cracked this one yet — but Fifteensquared have:
UK football fans will often partake in a pie and a Bovril at half-time, so they could be described as FAN FARE
Peeled fruit to bring to bear (5)
Poland blocks cruises at sea displaying religious clothing (9)
I haven't cracked this one yet — but Fifteensquared have:
PL (International Vehicle Registration code for "Poland") blocks *(cruises) [anag: at sea ]
Acclaimed new nursing area of university (10)
I haven't cracked this one yet — but Fifteensquared have:
*(acclaimed) [anag: new ] nursing A
Occasionally falling from Estonia's volcano (4)
I haven't cracked this one yet — but Fifteensquared have:
[ occasional (letters) falling from ] E (s) T (o) N (i) A
Provide waffle right before I carve up pâté sandwiches (11)
I haven't cracked this one yet — but Fifteensquared have:
PATE sandwiches R (right) before *(i carve) [anag: up ]
Model Sierra almost market leader in UK soon? (11)
Division is Guardian's responsibility (4)
I haven't cracked this one yet — but Fifteensquared have:
Double definition
Madame in on criminal network identification (10)
Basis to restrict beer and ... (9)
... sex after heading to Long Island clubs is within the law (5)
I haven't cracked this one yet — but Fifteensquared have:
IT ("sex") after L (long) + I (island) + C (clubs)
Do ice dancing near South East London? (7)
I haven't cracked this one yet — but Fifteensquared have:
*(do ice) [anag: dancing ] near SE (South East)
The trouble and I take a circuitous route (7)
I haven't cracked this one yet — but Fifteensquared have:
ME AND 'ER ("the trouble and I") In Cockney rhyming slang, trouble and strife = wife, and Cockney's would traditionally pronouce HER as 'ER.
Down
Bollinger manufactures bottles of Mosel? (6)
I say are you writing up boring event with touchdown zone? (6)
I haven't cracked this one yet — but Fifteensquared have:
Homophone [ I say ] of ARE YOU + [ writing up ] <=YAWN ("boring event")
Take too many clothes off and ruin film (10)
I haven't cracked this one yet — but Fifteensquared have:
Double definition
Quietly one pockets 2/3 of bus fare in Japan (5)
I haven't cracked this one yet — but Fifteensquared have:
SH ("quietly") + I (one) pockets [ 2/3 of ] (b) US
Ranch dressing one genuine reason to leave restaurant in a hurry (9)
I haven't cracked this one yet — but Fifteensquared have:
FARM ("ranch") dressing A (one) + REAL ("genuine")
Flower with blue and white roots (4)
I haven't cracked this one yet — but Fifteensquared have:
Cryptic defintion – the NILE River ("flower", i.e. that which flows) has two major sources, the Blue Nile and the White Nile.
Wimbledon champion taking time to become US Grand Slammer? (8)
I haven't cracked this one yet — but Fifteensquared have:
(Carlos) ALCARAZ (the current men's "Wimbledon champion") taking T Alcatraz was an infamous prison (or "slammer") on an island in San Francisco (well worth a visit if you're ever in the vicinity)
Close screens partners are entangled! (8)
I haven't cracked this one yet — but Fifteensquared have:
END ("close") screens SN (South and North, "partners" in bridge) + ARE
Crestfallen or tickled about discovering oil? (10)
Christian perhaps rising to speak in a flowery manner (9)
I haven't cracked this one yet — but Fifteensquared have:
<=BALE ("Christian, perhaps, rising ) + ORATE ("to speak")
Desk jockeys were inside and treated like pieces of meat (8)
Party animal turns up volume of opera lyrics (8)
I haven't cracked this one yet — but Fifteensquared have:
LIB (Liberal "party") + <=OTTER ("animal", turns up)
What Detective Chief Superintendent typically did to get rank (6)
I haven't cracked this one yet — but Fifteensquared have:
A Detective Chief Superintendent may well have RAN CID (Criminal Investigation Department)
This could be Eccles High Street (6)
Top performers regularly at the farm (5)
Herald is bent on being heard (4)
Type letters or click words in the clue