Frizzy hairstyle (4)
I believe the answer is:
afro
'frizzy hairstyle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for afro that I've seen before include "Tightly-curled 4 down" , "Of hair style, tightly curled and bushy" , "Luxuriant (black) hairstyle" , "Rounded, curled hairstyle" , "Hairstyle adopted by the young Michael Jackson" .)