Trivial political figure, overlooked by a hitman after turning up (8)
I believe the answer is:
nugatory
'trivial' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for nugatory that I've seen before include "Young art (anag) -- worthless" , "Insignificant or trivial" , "of little worth" , "Futile, of no value" , "Worthless - trifling" .)