Supermarket has style (4)
I believe the answer is:
perm
'style' is the definition.
(hair style)
'supermarket has' is the wordplay.
'has' indicates the answer is hidden within the clue.
'PERM' can be found hidden inside 'supermarket'.
(Other definitions for perm that I've seen before include "To curl (hair)" , "Old-fashioned haircut" , "Russian port; hairstyle" , "A hairdo; Urals city" , "make waves" .)