Finished work so went to bed (7)
I believe the answer is:
retired
I believe this clue is a double definition.
'finished work' is the first definition.
(I've seen this before)
'went to bed' is the second definition.
('retire' can be a synonym of 'go to bed')
'so' is the link.
(Other definitions for retired that I've seen before include "Ceased working" , "Gave up job, relaxed on pension" , "Finished work" , "Turned in" , "went back" .)