Go home and go to bed (4,2)
I believe the answer is:
turn in
'go to bed' is the definition.
(synonyms)
'go home' is the wordplay.
'go' becomes 'turn' (as in one's go or turn in a game).
'home' becomes 'in' (to be in is to be (at) home).
'turn'+'in'='TURN-IN'
'and' acts as a link.
(Other definitions for turn in that I've seen before include "Surrender" , "Hand over - retire" , "Retire to bed" , "Prepare for sleep" , "Go to bed, changing direction" .)