Husband about to crash photo of speech (6)
I believe the answer is:
phonic
'of speech' is the definition.
(I've seen this in another clue)
'husband about to crash photo' is the wordplay.
'husband' becomes 'h' (abbreviation).
'about' becomes 'on' (as in a book 'on' a certain topic).
'to crash' is an insertion indicator (inserted letters crash into another word).
'photo' becomes 'pic' (short for picture).
'h'+'on'='hon'
'hon' put inside 'pic' is 'PHONIC'.
(Other definitions for phonic that I've seen before include "Chopin (anag) - relating to sound" , "Of vocal sounds" , "Involved with sound" , "Chopin (anag) - related to learning by sounds" .)