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All answers having "Dupes" as clue:

3 Character Answers:

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HAS



4 Character Answers:

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CONS

SAPS

USES



5 Character Answers:

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FOOLS

GULLS

PAWNS

TAKES

TOOLS



6 Character Answers:

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CHEATS

CHUMPS

DITTOS

REPROS

SETUPS

TRICKS



7 Character Answers:

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BEFOOLS

PATSIES

PIGEONS

TAKESIN

XEROXES



8 Character Answers:

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CATSPAWS

SCHNOOKS

SNOOKERS