Go away to live with a bird (4,2)
I believe the answer is:
beat it
'go away' is the definition.
(I've seen this before)
'live with a bird' is the wordplay.
'live' becomes 'be' (synonyms).
'with' is a charade indicator (letters next to each other).
'bird' becomes 'tit' (tit is a kind of bird).
'be'+'a'+'tit'='BEAT IT'
'to' is the link.
(Other definitions for beat it that I've seen before include "Slang order to go away, get lost" , "Scram, get lost" , "try out drum kit?" , "Get going" , "Scarper" .)