Fancy hairdo (4)
I believe the answer is:
coif
'fancy hairdo' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for coif that I've seen before include "Headgear" , "Cap worn by fundamentalist Mormon women: hairstyle" , "what can be made of lawn?" , "Dress the hair" , "Nun's cap" .)