Coiffure of supermodel (4)
I believe the answer is:
perm
'coiffure' is the definition.
(I know that perm is a type of wave)
'of supermodel' is the wordplay.
'of' indicates the answer is hidden within the clue.
'PERM' is hidden in the letters of 'supermodel'.
(Other definitions for perm that I've seen before include "Wavy hairstyle" , "make waves" , "Old-fashioned haircut" , "Give a wave" , "Hair setting treatment; pools selection system" .)