Some disgust as karma for Labour (4)
I believe the answer is:
task
'for labour' is the definition.
(both can mean a chore)
'some disgust as karma' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'TASK' is hidden within 'disgust as karma'.
(Other definitions for task that I've seen before include "Arduous bit of work" , "Piece of work to be done" , "Job to be done" , "Difficult piece of work" , "Allocate work" .)