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All answers having "Couch" as clue:

4 Character Answers:

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LAIR

SAGO

SOFA



5 Character Answers:

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DIVAN

SHAPE



6 Character Answers:

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DAYBED

PHRASE

POTATO

SETTEE



7 Character Answers:

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OTTOMAN



8 Character Answers:

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ABATTOIR



11 Character Answers:

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WELLORDERED



13 Character Answers:

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TELEVISIONSET