Work stirring soup (4)
I believe the answer is:
opus
'work' is the definition.
(I've seen this before)
'stirring soup' is the wordplay.
'stirring' indicates an anagram.
'soup' with letters rearranged gives 'OPUS'.
(Other definitions for opus that I've seen before include "Work or composition, usually musical" , "Composer's work" , "(Numbered) musical composition" , "Work of 25 perhaps" , "Soup (anag.)" .)