Once more weary, went to bed (7)
I believe the answer is:
retired
'went to bed' is the definition.
('retire' can be a synonym of 'go to bed')
'once more weary' is the wordplay.
'once more' becomes 're' (I've seen this in other clues).
'weary' becomes 'tired' ('tired' can be similar in meaning to 'weary').
're'+'tired'='RETIRED'
(Other definitions for retired that I've seen before include "retreated" , "Went to bed or gave up work" , "went back" , "Put out to pasture" , "In bed, withdrew" .)