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All answers having "Go against" as clue:

4 Character Answers:

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BUCK

DEFY

FACE



5 Character Answers:

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FLOUT



6 Character Answers:

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OPPOSE

RESIST



7 Character Answers:

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DISOBEY

VIOLATE



10 Character Answers:

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CONTRAVENE



12 Character Answers:

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FLYINTHEFACE