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All answers having "Quirk" as clue:

3 Character Answers:

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TIC



4 Character Answers:

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KINK



5 Character Answers:

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TWIST



6 Character Answers:

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FOIBLE

ODDITY

STODGY

VAGARY



7 Character Answers:

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ANOMALY



8 Character Answers:

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CROTCHET



12 Character Answers:

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ECCENTRICITY

IDIOSYNCRASY