Mad for a bushy hairstyle (4)
I believe the answer is:
afro
'bushy hairstyle' is the definition.
(I've seen this in another clue)
'mad for a' is the wordplay.
'mad' indicates an anagram.
'for'+'a'='fora'
'fora' is an anagram of 'AFRO'.
(Other definitions for afro that I've seen before include "One cut" , "Hair-style from Dark Continent" , "Type of hairstyle - from Africa" , "Big hairstyle" , "Luxuriant (black) hairstyle" .)