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All answers having "Insignificant" as clue:

3 Character Answers:

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PUN



4 Character Answers:

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IDLE

MERE

NULL

PUNY

SLIM

SMAL

TINY



5 Character Answers:

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DINKY

EENSY

MINOR

PETIT

PETTY

SMALL



6 Character Answers:

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LITTLE

MEASLY

MINUTE

PALTRY

TINPOT

TWOBIT



7 Character Answers:

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NOMINAL

PEANUTS

TRIVIAL

UNNOTED



8 Character Answers:

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ONEHORSE

TRIFLING



9 Character Answers:

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JERKWATER

PENNYANTE

SMALLTIME



10 Character Answers:

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FRACTIONAL

NEGLIGIBLE



11 Character Answers:

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MICKEYMOUSE



13 Character Answers:

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BENEATHNOTICE

SMALLPOTATOES



15 Character Answers:

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OFNOCONSEQUENCE