Ancient Egyptian god who was ruler of the underworld and judge of the dead (6)

I believe the answer is:

osiris

(Other definitions for osiris that I've seen before include "Egyptian god - sis or I (anag)" , "dead judge?" , "Husband of Isis, father of Horus - sis or I (anag)" , "Egyptian deity" , "underworld boss" .)

I've seen this clue in The Independent.

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