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All answers having "Social group" as clue:

3 Character Answers:

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SET



4 Character Answers:

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ANTS

CLAN

CLUB

FRAT

KITH

SEPT



5 Character Answers:

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CASTE

CLASS

POSSE

SALON

TRIBE



6 Character Answers:

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CIRCLE

TEASET



10 Character Answers:

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SISTERHOOD



11 Character Answers:

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MIDDLECLASS