Morsel for Miss Muffet (4)
I believe the answer is:
curd
'morsel for miss muffet' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for curd that I've seen before include "Coagulated milk, used to make cheese" , "Thickened milk" , "Part of milk" , "Basis for cheese" , "Fatty stuff" .)