One who wields power unofficially — a term originally describing Richelieu's secretary, Pre Joseph (8,5)
I believe the answer is:
eminence grise
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for eminence grise that I've seen before include "One exercising power in the background" , "Power behind the throne" .)
I've seen this clue in The Times.
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