Crossword Genius

Recover what's due in principle following club - that's what any gambler would do?

Ross

I believe the answer is:

claw back

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'do?' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for claw back that I've seen is " Recoup (money) by means of taxation".)

I've seen this clue in the Irish Times.
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