Crossword Genius

A price to whistle at? (5)

Ross

I believe the answer is:

penny

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This clue could be a double definition.

'a price' is the first definition.
The definition and answer can be both related to property as well as being singular nouns.
Maybe there's a link between them I don't understand?

'whistle at?' is the second definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'to' is the link.

Can you help me to learn more?

(Other definitions for penny that I've seen before include "Small unit of currency" , "Copper coin" , "Bronze coin" , "Coin spent by the desperate?" , "British coin" .)

I've seen this clue in the Evening Standard.
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