Those of an Australian game? (5)
I believe the answer is:
rules
'those of an australian' is the definition.
I can't judge whether this defines the answer.
'game?' is the wordplay.
I cannot quite see how this works, but
'game?' could be 'ru' (rugby union) and 'ru' is found within the answer.
The remaining letters 'les' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rules that I've seen before include "Australian football" , "In Australia, football" , "controls" , "is supreme, OK?" , "instructions" .)