The right birds for uncle (5)
I believe the answer is:
remus
'uncle' is the definition.
(I've seen this before)
'the right birds' is the wordplay.
'the right' becomes 'r' (common abbreviation).
'birds' becomes 'emus' (emu is a kind of bird).
'r'+'emus'='REMUS'
'for' is the link.
(Other definitions for remus that I've seen before include "Suckled by a she-wolf, I was" , "One responsible for capital" , "Uncle --, US narrator" , "Famous twin" , "Uncle character in US folk stories" .)