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All answers having "Channel" as clue:

3 Character Answers:

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GAT

RUT



4 Character Answers:

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BAND

DUCT

LANE



5 Character Answers:

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CANAL

CHUTE

DITCH

DRAIN

FLUME

GULLY

INLET

INSET

OWNER

ROUTE

STEER

STRIA



6 Character Answers:

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GROOVE

SHUTUP

SLUICE

STRAIT

STREAM

TRENCH



7 Character Answers:

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CONDUIT

SEAGATE

TIDEWAY



8 Character Answers:

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RIVERBED



9 Character Answers:

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TVSTATION