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All answers having "Foolishness" as clue:

5 Character Answers:

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APERY

FOLLY



6 Character Answers:

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ANTICS

BRUISE

IDIOCY

LUNACY

STRESS

TARTAN



7 Character Answers:

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EXCERPT

FATUITY

IDIOTRY

INANITY



8 Character Answers:

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NONSENSE



9 Character Answers:

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INANITIES



10 Character Answers:

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BUFFOONERY

INEPTITUDE



13 Character Answers:

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JIGGERYPOKERY