Expression of disapproval about a job (4)
I believe the answer is:
task
'job' is the definition.
(synonyms)
'expression of disapproval about a' is the wordplay.
'expression of disapproval' becomes 'tsk' (sound made to indicate disapproval).
'about' is an insertion indicator.
'tsk' placed around 'a' is 'TASK'.
(Other definitions for task that I've seen before include "Job of work" , "Give mission" , "Allocate work" , "commission" , "Job, undertaking" .)