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All answers having "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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GRAVE

GREAT

MAJOR



6 Character Answers:

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OFNOTE



7 Character Answers:

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NOTABLE

PIVOTAL

SALIENT

SERIOUS

SPECIAL

WEIGHTY



8 Character Answers:

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CARDINAL

EVENTFUL



9 Character Answers:

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REDLETTER



10 Character Answers:

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SEQUENTIAL



11 Character Answers:

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SIGNIFICANT



13 Character Answers:

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OFCONSEQUENCE