Crossword Genius

Large omen about single swimmer (9)

Ross

I believe the answer is:

lemonsole

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'swimmer' is the definition.
I know nothing about this answer so I can't judge whether this works.

'large omen about single' is the wordplay.
'large' becomes 'L' (eg in clothes sizes).
'about' indicates an anagram.
'single' becomes 'sole' (similar in meaning).
'omen' is an anagram of 'emon'.
'l'+'emon'+'sole'='LEMONSOLE'

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I've seen this clue in The Daily Express.
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