Chooses to veto new school (5)
I believe the answer is:
votes
'chooses' is the definition.
(voting is a kind of choosing)
'veto new school' is the wordplay.
'new' is an anagram indicator.
'school' becomes 's'.
'veto' anagrammed gives 'vote'.
'vote'+'s'='VOTES'
'to' acts as a link.
(Other definitions for votes that I've seen before include "Chooses a candidate" , "often indicated by hands" , "these should get cast" , "Proposes" , "Elects by ballot" .)