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All answers having "Legit" as clue:

4 Character Answers:

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REAL



5 Character Answers:

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LICIT

SEEMS

VALID



6 Character Answers:

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KOSHER

LAWFUL



7 Character Answers:

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CRICKET



10 Character Answers:

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ABOVEBOARD

ONTHEUANDU

UDNAUEHTNO



12 Character Answers:

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ONTHEUPANDUP