Voting system is set in genuine retaliation (8)
I believe the answer is:
reprisal
'retaliation' is the definition.
(I've seen this before)
'voting system is set in genuine' is the wordplay.
'voting system' becomes 'pr' (I've seen this in other clues).
'set in' is an insertion indicator.
'genuine' becomes 'real' ('real' is associated in meaning with 'genuine').
'pr'+'is'='pris'
'pris' inserted into 'real' is 'REPRISAL'.
(Other definitions for reprisal that I've seen before include "Act of retaliation or vengeance" , "hitting back" , "compensation" , "Counterattack" , "Retaliatory deed" .)