Revenge or retaliation (8)
I believe the answer is:
reprisal
I believe this clue is a double definition.
'revenge' is the first definition.
(I know that reprisal is a type of revenge)
'retaliation' is the second definition.
(I know that reprisal is a type of retaliation)
(Other definitions for reprisal that I've seen before include "comeback" , "Counterattack" , "Retaliatory action against an enemy" , "Retaliatory deed" , "Act of revenge" .)