More killings to upset government expert (14)
I believe the answer is:
kremlinologist
'government expert' is the definition.
(an expert in Russian government)
'more killings to upset' is the wordplay.
'upset' indicates anagramming the letters.
'more'+'killings'+'to'='morekillingsto'
'morekillingsto' with letters rearranged gives 'KREMLINOLOGIST'.
(Other definitions for kremlinologist that I've seen before include "Connoisseur of reds" , "Moscow student" , "foreign policy specialist" .)