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All answers having "Passageway" as clue:

4 Character Answers:

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ADIT

DUCT

HALL

ITER

RAMP



5 Character Answers:

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AISLE

ALLEY

ENTRY

XOVER



6 Character Answers:

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ACCESS

ARCADE

AVENUE

TUNNEL



8 Character Answers:

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CORRIDOR



9 Character Answers:

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CROSSOVER



11 Character Answers:

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TIGHTSQUEZE