Tune from Townhouse is the sound of 'Rush' (5)

I believe the answer is:

woosh

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'tune' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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