Crossword Genius

With 65-Across, underwater creature that actually IS a 65-Across despite a common misconception (4)

Ross

I believe the answer is:

orca

(Other definitions for orca that I've seen before include "Sea creature" , "ship" , "School killer" , "Massive killer" , "Killer in deep" .)

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