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All answers having "Bring about" as clue:

3 Character Answers:

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ERE



4 Character Answers:

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BREW

MAKE



5 Character Answers:

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BEGET

BREED

CAUSE

INCUR

VISTA

WREAK



6 Character Answers:

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CHANCE

CREATE

EFFECT

INDUCE

LEADTO

REFUGE



7 Character Answers:

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ACHIEVE

ARRANGE

INSPIRE

OPERATE



8 Character Answers:

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ENGENDER

GENERATE



9 Character Answers:

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INSTIGATE



11 Character Answers:

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INTELLIGENT

ORCHESTRATE

PROBLEMATIC



12 Character Answers:

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HIGHSPIRITED



13 Character Answers:

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THENCEFORWARD