Martine changes apparel (7)
I believe the answer is:
raiment
'apparel' is the definition.
(I know that apparel can be written as raiment)
'martine changes' is the wordplay.
'changes' indicates an anagram.
'martine' with letters rearranged gives 'RAIMENT'.
(Other definitions for raiment that I've seen before include "Traditional clothing" , "Minaret (anag) - clothing" , "Gear" , "Especially fine or decorative clothing" , "clothing for poets" .)