Veto arrangement to mark a ballot-paper (4)
I believe the answer is:
vote
'mark a ballot-paper' is the definition.
I can't tell whether this definition defines the answer.
'veto arrangement' is the wordplay.
'arrangement' is an anagram indicator.
'veto' anagrammed gives 'VOTE'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for vote that I've seen before include "Put one's cross" , "Express choice" , "Make election choice" , "Register one's choice" , "Ballot, exercise of franchise" .)