Brag; bird (4)
I believe the answer is:
crow
I believe this clue is a double definition.
'brag' is the first definition.
(I know that brag can be written as crow)
'bird' is the second definition.
(crow is a kind of bird)
(Other definitions for crow that I've seen before include "Brave" , "'As the - - flies'" , "shout in triumph" , "Gloat" , "Native American -- bird" .)