Male in the British Isles holding the highest hereditary title of the nobility (4)

I believe the answer is:

duke

(Other definitions for duke that I've seen before include "Highest hereditary title in Britain" , "- - Ellington (jazz musician)" , "Highest ranking British peer" , "Highest rank of British peer" , "Fist (sl.)" .)

I've seen this clue in The Mirror.

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