Lay off (6)
'lay off' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for desist that I've seen before include "Abstain, refrain" , "Forbear" , "Leave off (doing a thing)" , "Whoa, cease" , "Cease (from doing a thing)" .)
'lay off' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for idle that I've seen before include "Not occupied" , "Empty" , "Disliking work" , "Inert; lazy" , "Do nothing, laze" .)