Opposition to Australian account (8)
I believe the answer is:
aversion
'opposition' is the definition.
(thesaurus)
'australian account' is the wordplay.
'australian' becomes 'A' (common abbreviation).
'account' becomes 'version' (version is a kind of account).
'a'+'version'='AVERSION'
'to' acts as a link.
(Other definitions for aversion that I've seen before include "an object of dislike" , "A version of strong dislike" , "phobia" , "Abhorrence - loathing" , "A strong dislike for something - turn away from it" .)