God who was said to be in love with his sister while still in the womb(!) (6)

I believe the answer is:

osiris

(Other definitions for osiris that I've seen before include "once highly esteemed by Egyptians" , "Egyptian god of the underworld" , "Egyptian god of the dead" , "Egyptian god - sis or I (anag)" , "one Egyptians worshipped" .)

I've seen this clue in The New York Times.

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