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The main obstacle between Britain and Europe (7)

Ross

I believe the answer is:

channel

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'the main' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for channel that I've seen before include "Serve as a medium for (a spirit)" , "Length of water; radio station" , "Gutter; medium" , "Ditch" , "Furrow" .)

I've seen this clue in The Globe and Mail.
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