Wine I love in jar, drunk (5)
I believe the answer is:
rioja
'wine' is the definition.
(Rioja is an example)
'i love in jar drunk' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'in' means one lot of letters goes inside another.
'drunk' indicates an anagram.
'i'+'o'='io'
'jar' anagrammed gives 'rja'.
'io' inserted inside 'rja' is 'RIOJA'.
(Other definitions for rioja that I've seen before include "Open space (ancient Greek)" , "Popular Spanish wine" , "Spanish red wine" , "Spanish table wine" , "wine region" .)