Jack —, actor who played Steve McGarrett in US television series Hawaii Five-O from 1968-80 (4)

I believe the answer is:

lord

(Other definitions for lord that I've seen before include "10th" , "to be drunk?" , "Proprietor of a manor?" , "Member of the aristocracy" , "Noble; exclamation" .)

I've seen this clue in The Mirror.

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