Collins Concise English Dictionary © HarperCollins Publishers::
power broker n
  1. a person with power and influence, esp one who operates behind the scenes
WordReference Random House Learner's Dictionary of American English © 2020
pow•er•bro•ker or  pow•er bro•ker /ˈpaʊɚ ˌbroʊkɚ/USA pronunciation   n. [countable]
  1. Governmentone who uses power and influence, esp. a politician who controls votes:met with the mayor, the leading powerbroker in the city.

WordReference Random House Unabridged Dictionary of American English © 2020
pow•er•bro•ker  (pouər brō′kər),USA pronunciation n. 
  1. Governmenta person who wields great political, governmental, or financial power.
  • power + broker 1960–65, American.

'power broker' also found in these entries (note: many are not synonyms or translations):

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