Australian flightless bird (3)
I believe the answer is:
emu
'australian flightless bird' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for emu that I've seen before include "it'll never fly!" , "Flightless Aus. bird" , "Hull's character" , "Aussie bird" , "Extinct bird" .)