Crossword Genius

Port? Yes, foreign wine (5)

Ross

I believe the answer is:

rioja

I'm a little stuck... Click here to teach me more about this clue!

'foreign wine' is the definition.
'rioja' can be an answer for 'wine' (Rioja is an example). I am not certain of the 'foreign' bit.

'port? yes' is the wordplay.
'port?' becomes 'rio' (Rio de Janeiro is a port).
'yes' becomes 'ja' (I can't justify this - if you can you should believe this answer much more).
'rio'+'ja'='RIOJA'

Can you help me to learn more?

(Other definitions for rioja that I've seen before include "Open space (ancient Greek)" , "North Spanish wine" , "wine region" , "Spanish wine variety" , "Spanish table wine" .)

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