Selects by ballot (6)
I believe the answer is:
elects
'selects by ballot' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for elects that I've seen before include "Selects by ballot" , "Appoints via he ballot box" , "Votes in" , "Chooses by vote" , "Appoints to position in ballot" .)