Unclued lights, two of two words, are of a kind, verifiable in Brewer. Elsewhere, ignore two accents.
 

Across

12    Second horn and nail defective, and with one fewer hole in the head (10)
13    Champion forgetting wife’s secret (5)
14    Online mention special interest — all these replies! (7)
15    Still on the phone maybe? (10)
16    Tricky to improve on car roof (7)
20    Old king put round fence (4)
22    Order is ‘Work!’ rejecting fuss (7)
23    Dowdy type, unfeminine, is cut (4)
24    Keep hold of mite in central custody (7, two words)
26    In ocean, what foreign tree? (7)
31    Turn divine, taking fight to the deity (7)
34   ...