Chignon (3)
I believe the answer is:
bun
'chignon' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bun that I've seen before include "Something from Bath or Chelsea" , "Small cake - tied-up hair" , "Hairstyle, cake" , "Sweet roll and hairstyle" , "Small cake or bread roll" .)