Australia's unofficial national bird (3)
I believe the answer is:
emu
'australia's unofficial national 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 "Australian bird related to the ostrich" , "Parky's nemesis" , "Australian non-flyer" , "Flightless bird of Australia, like ostrich" , "Ostrich-like bird" .)