Oh, her – she sounds all right (3)

I believe the answer is:

kay

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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