She's so good that none can match her! (3)
I believe the answer is:
nun
This clue could be a double definition.
'she's' is the first definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I can't see?
'so good that none can match her' is the second definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I don't see?
Can you help me to learn more?
(Other definitions for nun that I've seen before include "Devout woman" , "whose son entered Promised Land" , "Member of religious order" , "eg Carmelite" , "One who's taken vows" .)