Coy perhaps over one’s husband? (9)
I believe the answer is:
maidenish
'coy' is the definition.
(coy or naive like a maiden)
'over one's husband?' is the wordplay.
'over' becomes 'maiden' (maiden is a kind of over).
'one's' becomes 'I's' (Roman numeral).
'husband?' becomes 'h'.
'maiden'+'is'+'h'='MAIDENISH'
'perhaps' is the link.
(Other definitions for maidenish that I've seen before include "innocent?" , "Like a girl" .)