Finish work and go to bed (6)
I believe the answer is:
retire
'go to bed' is the definition.
(synonyms)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for retire that I've seen before include "Give up working and go to bed" , "climb the stairs" , "Leave work; go back" , "Go to bed or quit work for good" , "Conclude employment or go to bed" .)