think tank 
noun
A body of experts providing advice and ideas on specific political or economic problems: a think tank devoted to the study of political and economic integration...
- The independent academy is regarded as a think tank for crucial political and social issues for the Chinese government.
- John moves on from his distinguished career as a student to working for a government think tank in a university.
- And recently a government think tank came up with the idea that people owning a second property should pay a higher rate of council tax.
Derivatives
think-tanker
- It will take some time for the mood of the American people to work its way into the politicians, policy makers, and think-tankers.
- He was a think-tanker who put his ideas to work and became a fabulously successful investor.
- I talked to several Pentagon policy officials and think-tankers last week about this argument, and I am starting to see its credibility.
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