Hairstyle primarily adhered to? The opposite (4)
I believe the answer is:
afro
'hairstyle' is the definition.
(afro is a kind of hairstyle)
'primarily adhered to? the opposite' is the wordplay.
'primarily' suggests taking the first letters.
'to? the opposite' becomes 'fro' (I've seen this before).
The initial letter of 'adhered' is 'a'.
'a'+'fro'='AFRO'
(Other definitions for afro that I've seen before include "Hairstyle with tight curls" , "Hairstyle with little thick curls" , "Rounded, curled hairstyle" , "Styling done to hair" , "Luxuriant (black) hairstyle" .)