Crossword Genius

She's a knockout! (7)

Ross

I believe the answer is:

stunner

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'she's' is the first definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'a knockout' is the second definition.
('stunner' can be a synonym of 'knockout')

Can you help me to learn more?

(Other definitions for stunner that I've seen before include "Powerful punch" , "A great beauty" , "Peach" , "Good-looker (informal)" , "Amazing turn of events (colloq.)" .)

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