Permanently grounded Australian flier (3)
I believe the answer is:
This clue could be a double definition.
'permanently grounded australian' is the first definition.
I know that 'australian' relates to this answer.
'flier' is the second definition.
(emu is a kind of birdanimal)
Can you help me to learn more?
(Other definitions for emu that I've seen before include "Australian running bird." , "Aussie runner" , "Extinct bird" , "Long-necked bird" , "one offering challenge to Hull?" .)