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Back the best one, having lost a couple (3,2)

Ross

I believe the answer is:

bet on

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'back' is the definition.
(to bet on something is to support or back it)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for bet on that I've seen is " Place a wager".)

I've seen this clue in the Sydney Morning Herald.
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