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All answers having "Superfluous" as clue:

5 Character Answers:

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EXTRA

SPARE

UNDUE



6 Character Answers:

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DETROP

FRILLY

OTIOSE

RATHER

REALLY

TENNIS



7 Character Answers:

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NORMANS



8 Character Answers:

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NEEDLESS

UNNEEDED

UNWANTED



9 Character Answers:

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REDUNDANT



12 Character Answers:

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NONESSENTIAL