Unwanted fat (4)
I believe the answer is:
flab
'unwanted fat' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for flab that I've seen before include "Sign of overeating" , "Sign of over-indulgence" , "Fat acquired by over-eating" , "spare tyre?" , "Unwanted body fat" .)