Still delighted European Community is no more (6)
I believe the answer is:
static
'still' is the definition.
(synonyms)
'delighted european community is no more' is the wordplay.
'delighted' becomes 'ecstatic' (both can mean very happy).
'european community' becomes 'EC' (abbreviation).
'is no more' suggests deleting specific letters (some letters are no longer in the word).
'ecstatic' with 'ec' removed is 'STATIC'.
(Other definitions for static that I've seen before include "Unmoving like kind of electricity" , "Motionless like some kind of electricity" , "irritation for the listener?" , "fixed" , "Cast it (anag) - unmoving" .)