Some did less not working (4)
I believe the answer is:
idle
'not working' is the definition.
(idle means doing no work)
'some did less' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'IDLE' is hidden within 'did less'.
(Other definitions for idle that I've seen before include "Run out of gear" , "Frivolous" , "Lazy - unemployed" , "Futile" , "Useless" .)