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Cheated the punter and was more successful at it (3,6)

Ross

I believe the answer is:

did better

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'was more successful at it' is the definition.
I can't judge whether this defines the answer.

'cheated the punter' is the wordplay.
'cheated' becomes 'did' ().
'the punter' becomes 'better' (synonyms).
'did'+'better'='DID BETTER'

'and' acts as a link.

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