Tying up in port (9)

I believe the answer is:

anchorage

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'port' is the definition.
(I know that anchorage is a type of port)

I can't explain the rest of the clue.

(Other definitions for anchorage that I've seen before include "US port" , "northern outpost" , "US city" , "Roadstead" , "recluse's cell?" .)

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

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