Crossword Genius

How pool winners do it? (10)

Ross

I believe the answer is:

swimmingly

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

'how' is the definition.
Both the definition and answer are adverbs. Perhaps there's an association between them I don't understand?

'pool winners do it?' is the wordplay.
I cannot quite understand how this works, but
'pool' could be 'swimming' (swimming pool is a kind of pool) and 'swimming' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.
Want a hint initially instead of a full solution? Install my app