Crossword Genius

Port and of course German wine (5)

Ross

I believe the answer is:

rioja

'wine' is the definition.
(Rioja is an example)

'port and of course german' is the wordplay.
'port' becomes 'rio' (Rio de Janeiro is a port).
'and' means one lot of letters go next to another.
'of course german' becomes 'ja' ('yes' or 'of course' in German).
'rio'+'ja'='RIOJA'

(Other definitions for rioja that I've seen before include "Spanish wine type" , "Open space (ancient Greek)" , "wine region" , "Dry red wine from Spain" , "Spanish wine variety" .)

I've seen this clue in The Times.
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