Contradict victory over European judge (7)
I believe the answer is:
believe
'judge' is the definition.
(believing is a kind of judging)
'contradict victory over european' is the wordplay.
'contradict' becomes 'belie' ('belie' can be a synonym of 'contradict').
'victory' becomes 'v'.
'over' means one lot of letters go next to another.
'european' becomes 'e' (abbreviation e.g. EU).
'belie'+'v'+'e'='BELIEVE'
(Other definitions for believe that I've seen before include "Accept as true" , "Have religious faith" , "Think" , "Have faith; understand" , "Have confidence in" .)