Hairstyle making a comeback in 'Doctor Faustus' (4)
I believe the answer is:
afro
'hairstyle' is the definition.
(afro is a kind of hairstyle)
'a comeback in doctor faustus' is the wordplay.
'a comeback' shows that the letters should be reversed in order.
'in' indicates the answer is hidden within the clue.
'orfa' is hidden in the letters of 'doctor faustus'.
'orfa' backwards is 'AFRO'.
'making' acts as a link.
(Other definitions for afro that I've seen before include "Big hair?" , "shock treatment?" , "Retro hairdo" , "little Malian, for example" , "configuration of locks" .)