Crossword Genius

Ship — and what one may carry leaving Cuba's capital (4)

Ross

I believe the answer is:

argo

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'ship' is the definition.
(ship in Greek myth)

I can't explain the rest of the clue.

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(Other definitions for argo that I've seen before include "Old boat" , "Ancient ship" , "Mythical ship" , "Famous ship" , "Agro about the constellation" .)

I've seen this clue in The Guardian.
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