Crossword Genius

Husband of Sif, in Norse myth (4)

Ross

I believe the answer is:

thor

(Other definitions for thor that I've seen before include "Scandinavian thunder-god" , "Thunderous god" , "The Thunderer" , "Son of Odin and Freya" , "Wielder of hammer" .)

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