Husband may ask to alter veil (7)
I believe the answer is:
yashmak
'veil' is the definition.
(I know that yashmak is a type of veil)
'husband may ask to alter' is the wordplay.
'husband' becomes 'h'.
'to alter' indicates an anagram.
'h'+'may'+'ask'='hmayask'
'hmayask' with letters rearranged gives 'YASHMAK'.
(Other definitions for yashmak that I've seen before include "Muslim women's veil" , "Eastern veil" , "Moslem woman's double veil" , "Face-veil worn by Muslim women" , "Veil concealing face worn by Muslim women" .)