Roundish hairdo (4)
I believe the answer is:
'roundish hairdo' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for afro that I've seen before include "Hairdo of the 1960s and 70s" , "shock treatment?" , "Big hair?" , "Of hair style, tightly curled and bushy" , "Hair cut" .)