My roar, having bagged second bird (9)
I believe the answer is:
cormorant
'bird' is the definition.
(cormorant is a kind of bird)
'my roar having bagged second' is the wordplay.
'my' becomes 'cor' (I've seen this in other clues).
'roar' becomes 'rant'.
'having bagged' is an insertion indicator.
'second' becomes 'mo' (both are short periods of time).
'cor'+'rant'='corrant'
'corrant' placed around 'mo' is 'CORMORANT'.
(Other definitions for cormorant that I've seen before include "Large, voracious seabird" , "High-flier" , "Large, long-necked seabird" , "Large voracious sea bird" , "Large diving bird" .)