Bottled in Ontario, Japanese wine (5)

I believe the answer is:

rioja

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

'bottled in ontario japanese' is the wordplay.
'bottled in' indicates a hidden word.
'RIOJA' is hidden in the letters of 'ontario japanese'.

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

I've seen this clue in The Everyman puzzle in The Observer.

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