Hamburger holder (3)
I believe the answer is:
bun
'hamburger holder' 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 "Small cake or bread roll" , "Small cake - tied-up hair" , "A small cake, sweet and round" , "Small cake; hair style" , "Hair in tight coil" .)