Goes to bed in garret I reserved (7)
I believe the answer is:
retires
'goes to bed' is the definition.
('retire' can be a synonym of 'go to bed')
'in garret i reserved' is the wordplay.
'in' indicates the answer is hidden within the clue.
'RETIRES' is hidden within 'garret i reserved'.
(Other definitions for retires that I've seen before include "Withdraws" , "Gives up work" , "Goes to bed" , "turns in" , "Pulls out" .)