Old court favourite that's good to recall winning, as lesser players may sometimes do (3,2,2)

I believe the answer is:

ham it up

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'do' is the definition.
Both the definition and answer are verbs in their base form.
Maybe there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

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(Another definition for ham it up that I've seen is " Overact".)

I've seen this clue in The Guardian.

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