Antipodean marsupial (8)
I believe the answer is:
kangaroo
'antipodean marsupial' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for kangaroo that I've seen before include "Large Australian marsupial" , "Native marsupial Down Under" , "impromptu kind of court" , "Hopping marsupial" , "Marsupial (two friends of 19)" .)