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All answers having "Unexpected" as clue:

3 Character Answers:

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ODD



6 Character Answers:

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ABRUPT

IRONIC

SUDDEN



8 Character Answers:

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UNTOWARD



9 Character Answers:

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DARKHORSE

STARTLING



10 Character Answers:

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SURPRISING



12 Character Answers:

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OUTOFTHEBLUE



14 Character Answers:

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OUTOFLEFTFIELD