Spherical hairstyle (4)
I believe the answer is:
afro
'spherical 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 "Type of hairstyle - from Africa" , "Hairstyle with tight curls" , "Hairstyle with little thick curls" , "Shock description" , "Rounded, curled hairstyle" .)