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All answers having "On the level" as clue:

4 Character Answers:

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EVEN

REAL

TRUE



5 Character Answers:

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LEGAL

LEGIT

LICIT



6 Character Answers:

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HONEST



7 Character Answers:

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SERIOUS

SINCERE

UPANDUP



8 Character Answers:

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TRUTHFUL



10 Character Answers:

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ABOVEBOARD



13 Character Answers:

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FAIRANDSQUARE