Crossword Genius

Due west, iceboat’s prow to damage US port (5)

Ross

I believe the answer is:

miami

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'port' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for miami that I've seen before include "place associated with vice?" , "I put out of action when returning" , "tourist centre" , "Florida resort city, Beach" , "US city" .)

I've seen this clue in the Sydney Morning Herald.
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