Across
Serbian scientist fully prepared to ditch a student on returning (5)
I haven't cracked this one yet — but Fifteensquared have:
A [l] L SET (fully prepared), dropping one L (abbreviation for learner, as in L-plate = student), reversed (on returning). Nikola Tesla, born into a Serbian family in what is now Croatia (then part of the Austrian Empire).
Traditional girl one attending college in California (9)
One choosing to be more obese? (7)
Fried food recipe is fish (7)
Recalled correction about line in diacritical mark (5)
I haven't cracked this one yet — but Fifteensquared have:
EDIT (as a noun = a correction to printed text) reversed (recalled), around L (abbreviation for line). The symbol ~, used as a diacritical mark (added to a letter) in various languages: for example ñ in Spanish, or ã and õ in Portuguese.
Map feature in Nepal came misrepresented (9)
Servant carrying silverware? One’s stoked (12)
Lust she isn’t distributing - just a bit of slovenly debauchery? (12)
I haven't cracked this one yet — but Fifteensquared have:
Anagram (distributing) of LUST SHE ISN’T , then the first letter (just a bit) of S [lovenly]. A hint of an extended definition, because “slut” originally meant the same as “sloven” = an untidy or lazy woman, rather than a sexually promiscuous one.
Assessor of accounts backed excellent performance spaces (9)
Love in the morning for us (5)
Deliveries dispatched overlooking new disorder (7)
I haven't cracked this one yet — but Fifteensquared have:
OVER (in cricket, a sequence of balls bowled = deliveries) + SE [n] T (dispatched), without the N (abbreviation for new). Disorder, as a verb = overset = to throw into disarray.
Fictional detective: a married investigator probing swindle (7)
I haven't cracked this one yet — but Fifteensquared have:
A + M (abbreviation for married, in genealogical records) + PI (abbreviation for private investigator), all inserted into (probing) CON (swindle). Albert Campion, a character in detective stories by Margery Allingham.
Flannel enclosing cold flower (9)
I haven't cracked this one yet — but Fifteensquared have:
BUTTER UP (flannel, as a verb = talk flatteringly to someone) containing C (abbreviation for cold).
Returned surprised comment captivated by the flavouring (5)
I haven't cracked this one yet — but Fifteensquared have:
MY (my! = a comment expressing surprise) reversed (returned), contained in THE . A herb used for flavouring.
Down
Officer giving suggestion to senior officer’s group (8)
Nasty character putting oar in about love (8)
I haven't cracked this one yet — but Fifteensquared have:
SCULL (an oar, generally one of a pair used by a single rower) + IN , around O (zero = love in tennis scoring). Originally a servant employed to do dirty or unpleasant menial work in a kitchen (scullery); now used to mean a wicked or despised person.
Tree area rising becoming adequate (5)
I haven't cracked this one yet — but Fifteensquared have:
MAPLE (a type of tree), with the A (abbreviation for area) moving to the start (to the top, in a down clue = rising). I’d have said that adequate = enough, and ample = more than enough. But it’s the same general idea.
Treatment for unwanted growth repaired torn carpels (11)
Atmosphere in flight shunned by holy man (3)
I haven't cracked this one yet — but Fifteensquared have:
[st] AIR (a flight of steps) without ST (abbreviation for saint = holy person).
Twirling sticks carried by band from England (9)
I haven't cracked this one yet — but Fifteensquared have:
CANES (sticks), reversed (twirling), contained in SASH (band). Gaelic term (often derogatory) for a person from England; usually a noun, but it can also be an adjective (as it is here).
Large part of work - nearly the entirety - requiring singers (6)
Songs? Prominent violinist is what’s heard (6)
I’m USA caper possibly around cold water? But NZ are the holders! (11)
Poet’s lies reinterpreted as a matter of good manners (9)
I haven't cracked this one yet — but Fifteensquared have:
Anagram (reinterpreted) of POET’S LIES . French-derived term for formal politeness or courtesy.
Official upset over urban savagery (8)
Is French movement set apart? (8)
Disgusted comments on the rise in sandstorm (6)
I haven't cracked this one yet — but Fifteensquared have:
BOO + BAH (both expressions of disapproval), reversed (on the rise = upwards in a down clue). Strong winds carrying sand and dust in a desert.
Foil wrapping tail of bird in TV promotion (6)
I haven't cracked this one yet — but Fifteensquared have:
AVERT (foil, as a verb = prevent or deflect) around the last letter (tail) of [bir] D .
Allow a daughter to attend US institute (5)
I haven't cracked this one yet — but Fifteensquared have:
A + D (abbreviation for daughter) + MIT (abbreviation for the Massachusetts Institute of Technology).
Response in an instant on the radio (3)
Type letters or click words in the clue