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All answers having "Cul-de-sac" as clue:

4 Character Answers:

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TRAP



5 Character Answers:

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COURT



6 Character Answers:

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MASSED



7 Character Answers:

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DEADEND

IMPASSE

MUNDANE



10 Character Answers:

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BLINDALLEY



13 Character Answers:

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NOTHROUGHROAD