Crossword Genius

Port wine from Spain, 60% of it (3)

Ross

I believe the answer is:

rio

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'port' is the definition.
(Rio de Janeiro is a port)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for rio that I've seen before include "place of carnival" , "Manchester United player in South American city, in short?" , "Port, -- de Janeiro" , "... Grande, ... de Janeiro" , "- Ferdinand, footballer" .)

I've seen this clue in The Independent.
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