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All answers having "Erratic" as clue:

3 Character Answers:

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WON



4 Character Answers:

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NEEP

WILD



5 Character Answers:

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JERKY



6 Character Answers:

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FICKLE

SPOTTY



7 Character Answers:

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WAYWARD



9 Character Answers:

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HITORMISS

IRREGULAR

PLANETARY



10 Character Answers:

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CAPRICIOUS



13 Character Answers:

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UNPREDICTABLE