Went back to bed (7)
I believe the answer is:
retired
'went back' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for retired that I've seen before include "In bed, withdrew" , "went back" , "No longer working" , "out of office?" , "Ceased working" .)