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All answers having "High-hat" as clue:

4 Character Answers:

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SNOB

SNUB



5 Character Answers:

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SNOOT



6 Character Answers:

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SNOBBY

SNOOTY



7 Character Answers:

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STUCKUP



8 Character Answers:

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SNOBBISH



10 Character Answers:

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HOITYTOITY