You are better off repeating your clinical that you failed here in Canada.
Sorry kiddo but I'm going to give you some tough love and a bit of a reality check. It sounds like you need it, so I say this with no malice.
Previously you indicated that you don't want to do another 2 years of nursing school, yet you are entertaining the idea of moving 14,000 km away to go to nursing school where it's going to take you at least two years to complete anyway?
I won't even begin to talk about additional tens of thousands of dollars a move like that is going to cost you, let alone the time and money lost if you ever wanted to return and work in Canada. You may be a Canadian citizen, but in the eyes of the province you want to work in, you're an IEN.
If you are so desperate to become a nurse by entertaining the idea of going to school in Australia, suck it up and redo your third year clinicals, graduate here in Canada and then go down to Australia.
Hey, it's only two years out of your life right?