Vote in the Spanish on European court (5)
I believe the answer is:
elect
'vote in' is the definition.
'the spanish on european court' is the wordplay.
'the spanish' becomes 'el'.
'on' is a charade indicator (letters next to each other).
'european' becomes 'e' (abbreviation e.g. EU).
'court' becomes 'ct'.
'el'+'e'+'ct'='ELECT'
(Other definitions for elect that I've seen before include "Chosen, singled out" , "Chosen - to vote" , "Choose by vote" , "Put into power through the ballot box" , "Appoint through ballot" .)