Liberal supporting European vote, for instance (7)
I believe the answer is:
example
'instance' is the definition.
('example' can be a synonym of 'instance')
'liberal supporting european vote' is the wordplay.
'liberal' becomes 'ample' (I've seen this before**).
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'european' becomes 'e' (abbreviation e.g. EU).
'vote' becomes 'x' (how votes are marked).
'e'+'x'='ex'
'ample' put after 'ex' is 'EXAMPLE'.
'for' is the link.
(Other definitions for example that I've seen before include "Instance, specimen" , "not the actual version" , "Someone to emulate" , "Instance - pattern" , "Specimen, illustration" .)