Believe you’ll get the bird (7)
I believe the answer is:
swallow
I believe this is a double definition.
'believe' is the first definition.
(to swallow something is to accept or believe it)
'the bird' is the second definition.
(swallow is a kind of bird)
'you'll get' acts as a link.
(Other definitions for swallow that I've seen before include "Eat - bird - believe" , "Small migratory bird with forked tail" , "Fork-tailed bird" , "One with wings" , "Take in - migratory bird" .)