About state's houses (5)

I believe the answer is:

casas

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'houses' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'about state's' is the wordplay.
'about' becomes 'ca' (short for circa).
'state's' becomes 'sas' (South Australia).
'ca'+'sas'='CASAS'

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

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