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All answers having "Ante up" as clue:

3 Character Answers:

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BET

PAY



4 Character Answers:

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ETNA

GOIN

PONY



5 Character Answers:

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BUYIN

PAYIN



6 Character Answers:

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PREPAY



9 Character Answers:

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PAYTOPLAY



12 Character Answers:

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FEEDTHEKITTY



15 Character Answers:

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SWEETENTHEKITTY