Roundish do (4)
I believe the answer is:
afro
'roundish do' 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 18" , "configuration of locks" , "Hair-style from Dark Continent" , "Hairstyle with little thick curls" , "Type of hairstyle - from Africa" .)