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All answers having "Couple" as clue:

3 Character Answers:

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DUO

OWN

RHO

TIE

TWO

WED



4 Character Answers:

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DUAD

DUET

DYAD

EXES

ITEM

JOIN

LINK

MAIN

MATE

PAIN

PAIR

SPAN

YOKE



5 Character Answers:

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BRACE

EARLS

MATES

THIGH

UNITE



6 Character Answers:

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FLUFFY

JOINER

PAIRUP

SLEEPY

UNISON



7 Character Answers:

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CONNECT

TWOSOME



8 Character Answers:

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ESPRESSO



9 Character Answers:

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TAKESTOCK



10 Character Answers:

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MANANDWIFE



11 Character Answers:

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ATTHEDOUBLE