Stop working (6)
'stop working' is the definition.
(retiring from work)
This is all the clue.
(Other definitions for retire that I've seen before include "Cease working" , "Stop doing something permanently" , "call it a day" , "Go to bed or quit work for good" , "Finish following one's career" .)
(Other definitions for resign that I've seen before include "advice for the incompetent?" , "Turn over" , "Quit" , "Give up one's post" , "Leave office voluntarily" .)
'stop working' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for pack up that I've seen before include "Stop working" , "(Of a machine) break down" .)