Crossword Genius

Knockout (4)

Ross

I think it could be either:

lulu

kayo

'knockout' is the definition.
(synonyms)

This is all the clue.

(Other definitions for lulu that I've seen before include "Outstanding person; singer" , "Berg's unfinished opera" , "Glaswegian 60s pop singer" , "wonderful thing" , "Attractive girl" .)

I've seen this clue in The Times, The Telegraph and The Guardian.
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