Wine I love cracked jar contains (5)
I believe the answer is:
rioja
'wine' is the definition.
(Rioja is an example)
'i love cracked jar contains' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'cracked' indicates anagramming the letters.
'contains' means one lot of letters goes inside another.
'jar' with letters rearranged gives 'rja'.
'i'+'o'='io'
'io' going into 'rja' is 'RIOJA'.
(Other definitions for rioja that I've seen before include "wine region" , "Spanish red wine" , "kind of red" , "Wine from northern Spain" , "Spanish drink" .)