Ancient Egyptian god, ruler of the underworld (6)

I believe the answer is:

osiris

(Other definitions for osiris that I've seen before include "Egyptian god of the underworld" , "Egyptian god of the dead" , "God, husband of Isis" , "Husband of Isis, father of Horus - sis or I (anag)" , "once highly esteemed by Egyptians" .)

I've seen this clue in The Telegraph.

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