Refuse to allow free vote (4)
I believe the answer is:
veto
'refuse to allow' is the definition.
(I've seen this before)
'free vote' is the wordplay.
'free' is an anagram indicator.
'vote' anagrammed gives 'VETO'.
(Other definitions for veto that I've seen before include "Throw out" , "Stop" , "Formally forbid" , "Literally, 'I forbid'" , "Reject - vote (anag)" .)