Across
Screen third attempts (7)
Tautological petrolhead publication (7)
10a
Tries to get into authentic attire to lead final run (5,9)
See 9
Senior manager's allowance producing hatred (10)
Supervisor protecting deviant (4)
I haven't cracked this one yet — but Fifteensquared have:
Contained in suPERVisor
When the heart flutters, it's through groping (11)
Not long ago wrap-around skirts would be evocative (11)
As they say, end of story! (4)
Mother bound by patience breaking free (10)
26a
A few knights errant led by man into bonfire and so forth (3,6,5)
See 25
One's out – to score? (7)
Still into recent infantile stuff (7)
Down
End of butter and milk source guide (6)
I haven't cracked this one yet — but Fifteensquared have:
[butte]R + UDDER (milk source)
Referee briefly popped out for a smoke (6)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (out) of REFERE[e], briefly
Record parent misbehaving in conflict (10)
See 24
Beauty Editor sacked after an acid test (9)
I haven't cracked this one yet — but Fifteensquared have:
A PH (an acid test) + an anagram (sacked) of EDITOR – the Greek goddess of love and beauty
Wings of the archetypal duck (4)
Excellent packaging in universal make-up (8)
I haven't cracked this one yet — but Fifteensquared have:
Outside letters (packaging) of E[xcellen[T] in COSMIC (universal)
Material about part of the Middle East (8)
Act over fickle destiny of film maker (4,6)
Most of all, smokers suffering from nonprofit venture (9)
Students of Portuguese may be ignoring us (8)
Boss's ruse in Windermere (8)
Worked in a school that sounds rigid (6)
Affectionately move into multinational conglomerate (6)
Space explorers start to like this type of voice (5)
I haven't cracked this one yet — but Fifteensquared have:
NASA (space explorers) + L[ike]
4d
Raises idiot healthy eater? (4,5)
Type letters or click words in the clue