But surely you've heard that it's golden? (7)

I believe the answer is:

silence

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'you've heard that it's golden?' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the rest of the clue.

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(Other definitions for silence that I've seen before include "Absence of racket" , "It is golden acccording to the 1960s song" , "Nothing said" , "There's nothing heard" , "Quiet" .)

I've seen this clue in the Evening Standard.

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