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All answers having "Sober" as clue:

5 Character Answers:

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CLEAN

STAID



6 Character Answers:

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SADDEN

SEDATE

SOLEMN



7 Character Answers:

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AUSTERE



8 Character Answers:

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UNSTONED



9 Character Answers:

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TEMPERATE



10 Character Answers:

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ONTHEWAGON



11 Character Answers:

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CLEARHEADED