Capital of Western Australia (5)

I believe the answer is:

perth

'capital of western australia' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for perth that I've seen before include "Australian state capital" , "Capital of Western Australia" , "Australian or Scottish city" , "City of Scotland" , "Western Australia's capital" .)

I've seen this clue in The Wall Street Journal and The New York Times.

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