Cook soup for work (4)
I believe the answer is:
opus
'work' is the definition.
(I've seen this before)
'cook soup' is the wordplay.
'cook' is an anagram indicator.
'soup' is an anagram of 'OPUS'.
'for' is the link.
(Other definitions for opus that I've seen before include "A Latin work" , "Artistic work" , "Composition - magnum __" , "Musical piece" , "Composer's catalogue number" .)