9 across
Two
idiots
initiating
one
state
shooting,
perhaps
(13)
Two idiots initiating one state shooting, perhaps (13)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
See shooting, perhaps at the end — that's your definition, since an assassination might well be carried out by shooting someone. For the wordplay, string it together bit by bit: two idiots gives you ASS and ASS, then I stands for one, and finally NATION does the job for state, all lined up to spell out the answer.