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All answers having "Surly" as clue:

4 Character Answers:

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GRUM

UGLY



5 Character Answers:

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GRUFF



6 Character Answers:

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ORNERY



7 Character Answers:

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BEARISH



8 Character Answers:

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CHURLISH



9 Character Answers:

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TRUCULENT



10 Character Answers:

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ILLHUMORED

ILLNATURED