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All answers having "Circumference" as clue:

3 Character Answers:

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RIA

RIM



5 Character Answers:

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AMBIT

GIRTH



6 Character Answers:

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HOTDOG



7 Character Answers:

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CHEERUP

COMPASS

FURTIVE



9 Character Answers:

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PERIMETER

PERIPHERY



10 Character Answers:

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GOOSEBERRY