Delighted, seeing European Commission interference (8)
I believe the answer is:
ecstatic
'delighted' is the definition.
(I've seen this before)
'european commission interference' is the wordplay.
'european commission' becomes 'ec'.
'interference' becomes 'static' (static is a kind of interference).
'ec'+'static'='ECSTATIC'
'seeing' acts as a link.
(Other definitions for ecstatic that I've seen before include "On cloud nine" , "in a trance" , "Blissful" , "Overjoyed, quite delighted" , "Euphoric" .)