Possibly airs gown (4)
I believe the answer is:
sari
'gown' is the definition.
(I've seen this in another clue)
'possibly airs' is the wordplay.
'possibly' indicates an anagram.
'airs' with letters rearranged gives 'SARI'.
(Other definitions for sari that I've seen before include "Traditional dress of Indian women" , "Traditional Indian women's dress" , "Something worn" , "South Asian garment (variant spelling)" , "Asian dress" .)