Soup prepared for work (4)
I believe the answer is:
opus
'work' is the definition.
(I've seen this before)
'soup prepared' is the wordplay.
'prepared' is an anagram indicator.
'soup' with letters rearranged gives 'OPUS'.
'for' is the link.
(Other definitions for opus that I've seen before include "Musical composition in the soup" , "Piece of music (with number)" , "(Numbered) musical composition" , "Composer's catalogue number" , "Musical piece" .)