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All answers having "Very important" as clue:

3 Character Answers:

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BIG

KEY



4 Character Answers:

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HUGE



5 Character Answers:

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MAJOR

VITAL



6 Character Answers:

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URGENT



7 Character Answers:

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CRUCIAL

PIVOTAL



8 Character Answers:

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GIGANTIC



9 Character Answers:

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FRONTPAGE

MOMENTOUS



11 Character Answers:

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MAJORLEAGUE