Across
Arrival into major road bound to result in an accident (12)
I haven't cracked this one yet — but Fifteensquared have:
ADVENT (arrival) in MI (major road) SURE (bound)
Medium may take daughter in for time to create relationship? (5)
I haven't cracked this one yet — but Fifteensquared have:
RA[t]IO (relationship) with t (time) replaced by D (daughter) – but the clue seems the wrong way round?
Understanding provided by home schooling (9)
Chaos if chief absconds — any left? (7)
Incompetent tennis ace divides America (7)
Redesigned a Mister Man to be more conventional (10)
Noble expected to shelter monarch (4)
I haven't cracked this one yet — but Fifteensquared have:
DUE (expected) round K (king – monarch)
Mark seen regularly in serpents with just a silvery appearance (4)
I haven't cracked this one yet — but Fifteensquared have:
Alternate letters of sErPeNtS I’m not a fan of these non-acronyms used as solutions – but this is rather clever: EPNS stands for electroplated nickel silver, which would have a hallmark – maybe a serpent is one of them but I didn’t have time to trawl through this list
Pigs soiled ground? It's hardly earth-shattering news (4,6)
International award cheers popular officer (7)
First-class umpire confused start of match (7)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (confused) of UMPIRE M[atch]
Tosses around doubtful drinks (9)
Break down when director is lost for answer (5)
Focussed on a misleading description of homeopathic product? (12)
Down
Press coverage suspended at ten for negotiation (9)
Philosophy is part of unusual sitcom (8)
Tandem ride awaits her, if she is willing (5)
Train shortened trip in anger (9)
Can rising poet reject society? (6)
I haven't cracked this one yet — but Fifteensquared have:
A reversal (rising) of T [s] ELIOT (poet) minus s (society) – a new slant on the classic anagram
Pick up artist is European (5)
Parts of camphor gas mixture can be explosive! (6)
United side lacking depth — it looks silly to some (6)
I haven't cracked this one yet — but Fifteensquared have:
ONE (united) + SI[d]El lacking d (depth) I could well be missing something but this is one of the vaguest definitions I’ve seen!
Embarrassed by junior officer seen waving on a British vessel (3,6)
Retrained in Elba? (9)
I haven't cracked this one yet — but Fifteensquared have:
A reversal ‘up’, in a down clue, of ELBA gives ABLE (skilled) – easier if you know the classic palindrome
Bath Rome's set out in this place (8)
Remove old volume being talked about (6)
Spoil plan agent has to make a comeback (6)
Plan to adapt attic to store clubs (6)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (to adapt) of ATTIC round C (clubs)
One paid to have second puff (5)
Model initiated by party of socialist economic radicals (5)
Type letters or click words in the clue