Coagulated part of milk (4)
I believe the answer is:
curd
'coagulated part of milk' 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 "Part of milk" , "It's used in making cheese" , "Fatty stuff" , "Coagulated milk, used to make cheese" , "Basis for cheese" .)