I assault author spinning something about Adelaide (5,9)

I believe the answer is:

south australia

I'm a little stuck... Click here to teach me more about this clue!

'something about adelaide' is the definition.
I can't tell whether this definition defines the answer.

'i assault author spinning' is the wordplay.
'spinning' is an anagram indicator.
'i'+'assault'+'author'='iassaultauthor'
'iassaultauthor' with letters rearranged gives 'SOUTH AUSTRALIA'.

Can you help me to learn more?

(Another definition for south australia that I've seen is " far-off state".)

I've seen this clue in The Times.

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