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All answers having "Passage" as clue:

3 Character Answers:

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ELM

GAP

WAY



4 Character Answers:

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ADIT

CHAR

DOOR

DUCT

FLUE

HALL

ITER

LANE

RAMP



5 Character Answers:

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AISLE

ALLEY

ENTRY

NASAL

ROUTE



6 Character Answers:

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ACCESS

AVENUE

GERBIL

TIGHTS



7 Character Answers:

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AREAWAY

CONDUIT

EXCERPT

GATEWAY

TRANSIT



8 Character Answers:

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ALLEYWAY

CORRIDOR



9 Character Answers:

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NORTHWEST