Crossword Genius

In a poem, Byron called Cromwell "the ____ of usurpers” (6)

Ross

I believe the answer is:

sagest

(Other definitions for sagest that I've seen before include "Extremely clever" , "Most discerning" , "Most wise and prudent" , "Wisest" , "Gas set (anag.)" .)

I've seen this clue in The Times.
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