The work of stirring soup (4)
I believe the answer is:
opus
'the work' is the definition.
(thesaurus)
'stirring soup' is the wordplay.
'stirring' indicates anagramming the letters.
'soup' with letters rearranged gives 'OPUS'.
'of' is the link.
(Other definitions for opus that I've seen before include "Musical piece" , "Composer's work" , "Artistic work" , "Composer's catalogue number" , "Showing creative skill" .)