"Natural" hairdo (4)
I believe the answer is:
afro
'natural hairdo' 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 "little Malian, for example" , "Shock description" , "Type of 18" , "Curly hairstyle" , "Big curly hairdo" .)