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All answers having "Piddling" as clue:

4 Character Answers:

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MERE

PUNY

SLIM

TINY



5 Character Answers:

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DINKY

PETTY

TRIAL



6 Character Answers:

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LITTLE

MEAGER

MEASLY

PALTRY

SCANTY



7 Character Answers:

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TRIVIAL



8 Character Answers:

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PICAYUNE

TRIFLING



9 Character Answers:

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JERKWATER

SMALLTIME



13 Character Answers:

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INSIGNIFICANT



15 Character Answers:

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INCONSEQUENTIAL