Cereal topper (6)
I believe the answer is:
banana
'cereal topper' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for banana that I've seen before include "Tropical yellow fruit" , "Fruit with soft, sweet flesh" , "that may be unzipped" , "Another of 5 down" , "Plantain-like fruit" .)