Crossword Genius

Used a bent ploy in betting? (7,2)

Ross

I believe the answer is:

doubled up

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

'used' is the definition.
Although both the answer and definition are past participle verbs, I can't see how one could define the other.

'a bent ploy in betting?' is the wordplay.
I cannot really understand how this works, but
'bent' could be 'doubled' (doubling is a kind of bending) and 'doubled' is located in the answer.
The remaining letters 'up' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for doubled up that I've seen is " Bent in two".)

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