Crossword Genius

One who doesn't drink still has to pay out for food (5)

Ross

I believe the answer is:

patty

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This could be a double definition.

'one who doesn't drink still has to pay' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'for food' is the second definition.
(patty is a kind of food)

'out' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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