In Genesis and the Books of Chronicles, the son of Cush, great-grandson of Noah (6)

I believe the answer is:

nimrod

(Other definitions for nimrod that I've seen before include "Mighty hunter of Genesis" , "Antarctic summit" , "Mighty hunter of the Bible" , "Best-known of Elgar's Enigma Variations" , "Might hunter of Genesis" .)

I've seen this clue in The Independent.

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