Monodon monoceros, more familiarly (7)

I believe the answer is:

narwhal

(Other definitions for narwhal that I've seen before include "beast" , "Animal with large spiral tusk" , "Marine mammal, the male having a spiral ivory tusk" , "Small Arctic whale" , "Cetacean with large tusk" .)

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

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