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All answers having "Couples" as clue:

4 Character Answers:

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DUOS

PIRS

TIES

TWOS

WEDS



5 Character Answers:

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DUADS

DYADS

ITEMS

JOINS

PAIRS

YOKES



6 Character Answers:

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GOLFER

TWAINS



7 Character Answers:

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PAIRSUP



8 Character Answers:

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ATTACHES

TWOSOMES