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All answers having "Aboveboard" as clue:

4 Character Answers:

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OPEN



5 Character Answers:

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LEGAL

LEGIT

LICIT

OVERT



6 Character Answers:

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HONEST

OPENLY



7 Character Answers:

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ETHICAL

UPANDUP



9 Character Answers:

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ALLOWABLE



10 Character Answers:

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ONTHELEVEL



12 Character Answers:

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PUDNAPUEHTNO