Reincarnate as a bird and just go! (4,2)
I believe the answer is:
beat it
'just go' is the definition.
(phrase used to tell someone to go away)
'reincarnate as a bird' is the wordplay.
'reincarnate as' becomes 'bea' (I can't justify this - if you can you should give a lot more credence to this answer).
'a bird' becomes 'tit' (tit is a kind of bird).
'bea'+'tit'='BEAT IT'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for beat it that I've seen before include "Scram, take a powder" , "Make off hastily" , "Clear off!" , "try out drum kit?" , "make off furtively" .)