Broken jar contains one old wine (5)
I believe the answer is:
rioja
'wine' is the definition.
(Rioja is an example)
'broken jar contains one old' is the wordplay.
'broken' indicates anagramming the letters.
'contains' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'jar' is an anagram of 'rja'.
'i'+'o'='io'
'rja' placed around 'io' is 'RIOJA'.
(Other definitions for rioja that I've seen before include "it comes from grapevine" , "Spanish wine type" , "Popular Spanish wine" , "kind of red" , "Spanish drink" .)