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All answers having "Convertible" as clue:

3 Character Answers:

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BED

CAR



4 Character Answers:

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AUTO

SOFA

SOFT



6 Character Answers:

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FOLDUP

RAGTOP



7 Character Answers:

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OPENTOP

SOFABED

SOFTTOP



8 Character Answers:

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ROADSTER



9 Character Answers:

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SLEEPSOFA

SPORTYCAR



11 Character Answers:

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STUDIOCOUCH