Australians sides with solution for financial backer (5)

I believe the answer is:

angel

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This might be a double definition.

'australians sides with solution for financial' is the first definition.
I know that 'financial' relates to this answer.

'backer' is the second definition.
(an angel is a financial backer)

Can you help me to learn more?

(Other definitions for angel that I've seen before include "Top D [DECORATION]" , "Theatre backer" , "Investor in a theatrical venture" , "One backing plays" , "Obliging person" .)

I've seen this clue in the Sydney Morning Herald.

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