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She's so good, none can imitate her (3)

Ross

I believe the answer is:

nun

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

I cannot understand how the rest of the clue works.

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(Other definitions for nun that I've seen before include "Carmelite, for example" , "One who's taken vows" , "Joshua's father" , "She's a member of a religious community" , "religious person" .)

I've seen this clue in the Evening Standard.
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