Wine I love in cracked jar (5)
I believe the answer is:
rioja
'wine' is the definition.
(Rioja is an example)
'i love in cracked jar' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'in' indicates putting letters inside.
'cracked' indicates anagramming the letters.
'i'+'o'='io'
'jar' with letters rearranged gives 'rja'.
'io' placed into 'rja' is 'RIOJA'.
(Other definitions for rioja that I've seen before include "Spanish wine variety" , "it comes from grapevine" , "Open space (ancient Greek)" , "wine region" , "North Spanish wine" .)