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All answers having "Ban" as clue:

4 Character Answers:

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DENY

STOP

TABU

TEST

VETO



5 Character Answers:

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ATEST

BLIST

DEBAR

EXILE

TABOO



6 Character Answers:

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FORBID

OUTLAW



7 Character Answers:

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ABOLISH

EMBARGO



8 Character Answers:

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PROHIBIT



9 Character Answers:

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BLACKLIST

PROSCRIBE



11 Character Answers:

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PROHIBITION