The remainder don't work (4)
I believe the answer is:
rest
This clue could be a double definition.
'the remainder' is the first definition.
(synonyms)
'don't work' is the second definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for rest that I've seen before include "'Relax, pause from work (4)'" , "Take it easy, have a break" , "Others; cease work" , "Remainder; be inactive" , "Change is as good as this, they say" .)