Powerful ruler (9)

I believe the answer is:

potentate

'powerful ruler' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for potentate that I've seen before include "A monarch or ruler" , "authority" , "Powerful autocratic ruler" , "Mogul" .)

I've seen this clue in the LA Times, The Sunday Times, The Telegraph, the Sydney Morning Herald and The Times.

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