Spanish wine jar I smashed when empty (5)
I believe the answer is:
rioja
'spanish wine' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for rioja that I've seen before include "Dry red wine from Spain" , "Popular Spanish wine" , "Spanish wine type" , "Open space (ancient Greek)" , "it comes from grapevine" .)