Cassowary cousin (3)
I believe the answer is:
emu
'cassowary cousin' 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" , "it can't get off the ground" , "Extinct bird" , "Flightless bird of Australia, like ostrich" , "Australian running bird." .)