European Community still jubilant (8)
I believe the answer is:
ecstatic
'jubilant' is the definition.
(I've seen this before)
'european community still' is the wordplay.
'european community' becomes 'ec' (abbreviation).
'still' becomes 'static' (synonyms).
'ec'+'static'='ECSTATIC'
(Other definitions for ecstatic that I've seen before include "Cock-a-hoop" , "Really overjoyed, gleeful" , "Feeling great rapture or delight" , "Jubilant" , "Feeling immense joy" .)