Antipodean soldier (5)
I believe the answer is:
anzac
'antipodean soldier' is the definition.
(Australian and New Zealand Army Corps soldier)
This is all the clue.
(Other definitions for anzac that I've seen before include "World War One Antipodean soldier" , "Australasian soldier" , "World War One Australian or NZ soldier" , "digger" , "Old warrior" .)