Oh, she sounds so good! (3)

I believe the answer is:

kay

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'good' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for kay that I've seen before include "K" , "Eleventh letter; girl's name" .)

I've seen this clue in the Evening Standard.

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