Crossword Genius

... unlimited port? (4)

Ross

I believe the answer is:

oban

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'port?' is the definition.
(Oban is a Scottish port)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for oban that I've seen before include "Port in W. Scotland" , "Northern port" , "Western Scottish port" , "small Scottish port" , "Argyll seaport" .)

I've seen this clue in The Telegraph.
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