Marmalade chunk (4)
I believe the answer is:
rind
'marmalade chunk' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rind that I've seen before include "Zest" , "Cheese or fruit skin" , "'Peel, bark (4)'" , "Skin of bacon" , "Outer layer (of cheese)" .)