Fellow that's used by smugglers? (4)

I believe the answer is:

cove

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'fellow' is the definition.
(British slang term)

I can't explain the rest of the clue.

(Other definitions for cove that I've seen before include "A small inlet or estuary" , "Small bay or slangy man" , "Small sheltered bay - man (old slang)" , "Sheltered bay, inlet" , "Small inlet or slang man" .)

I've seen this clue in The Telegraph.

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