Open, the voter changes (5)
I believe the answer is:
overt
'open' is the definition.
(I know that open can be written as overt)
'voter changes' is the wordplay.
'changes' indicates an anagram.
'voter' anagrammed gives 'OVERT'.
'the' acts as a link.
(Other definitions for overt that I've seen before include "Open to view" , "not disguised" , "Trove (anag.)" , "Patent, evident" , "____ is able to be seen" .)