European vote I’m fiddling – that’s controversial (7)
I believe the answer is:
emotive
'controversial' is the definition.
(I've seen this before)
'european vote i'm fiddling' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'fiddling' indicates anagramming the letters.
'vote'+'im'='voteim'
'voteim' anagrammed gives 'motive'.
'e'+'motive'='EMOTIVE'
'that's' acts as a link.
(Other definitions for emotive that I've seen before include "Contentious" , "Arousing strong feelings" , "Affecting, moving" , "Tending to arouse feelings" , "arousing passion" .)