Crossword Genius

Fills drink after win (5,2)

Ross

I believe the answer is:

takes up

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

'fills' is the definition.
(taking up is a kind of filling)

'drink after win' is the wordplay.
I cannot really see how this works, but
'drink' could be 'sup' (to sup is to drink) and 'sup' is found in the answer.
'win' could be 'take' (taking is a kind of winning) and 'take' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Independent.
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