Steers vote among one's constituents (4)
I believe the answer is:
oxen
'steers' is the definition.
(I've seen this before)
'vote among one's constituents' is the wordplay.
'vote' becomes 'x' (how votes are marked).
'among' is an insertion indicator.
'constituents' indicates an anagram.
'one' with letters rearranged gives 'oen'.
'x' put into 'oen' is 'OXEN'.
(Other definitions for oxen that I've seen before include "Large bovine animals" , "Horned farm animals" , "Doctored bulls" , "Bullocks" , "Domesticated cattle" .)