Port and fine German wine (5)
I believe the answer is:
rioja
'wine' is the definition.
(Rioja is an example)
'port and fine german' is the wordplay.
'port' becomes 'rio' (Rio de Janeiro is a port).
'and' says to put letters next to each other.
'fine german' becomes 'ja' (I can't explain this - if you can you should give a lot more credence to this answer).
'rio'+'ja'='RIOJA'
Can you help me to learn more?
(Other definitions for rioja that I've seen before include "North Spanish wine" , "Spanish wine variety" , "Dry red wine from Spain" , "Spanish red wine" , "Spanish table wine" .)