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All answers having "Incentive" as clue:

3 Character Answers:

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RIP



4 Character Answers:

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BAIT

GOAD

SPUR

THEE



5 Character Answers:

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BONUS

COPRA

DRIVE



6 Character Answers:

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ABRUPT

CARROT

MOTIVE



7 Character Answers:

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IMPETUS



8 Character Answers:

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STIMULUS



9 Character Answers:

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OUTANDOUT