She's so good, none can imitate her (3)
I believe the answer is:
nun
'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.
Can you help me to learn more?
(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" .)