Eggy bun (7)
I believe the answer is:
brioche
'eggy bun' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for brioche that I've seen before include "Sponge cake or roll" , "Sweet yeast bread" , "Sweet french roll" , "French bread roll" , "Soft loaf, rich with butter and eggs" .)