Crossword Genius

Long ivory tooth (4)

Ross

I believe the answer is:

tusk

(Other definitions for tusk that I've seen before include "'Long pointed tooth, of an elephant say (4)'" , "Walrus's long tooth" , "Protruding ivory, of elephant say" , "Elongated tooth" , "Ivory-coloured dentine" .)

I've seen this clue in The Times.
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