Crossword Genius

With 48-Across, underwater creature that's certainly not a 48-Across (3)

Ross

I believe the answer is:

sea

(Other definitions for sea that I've seen before include "Vast expanse" , "Part of ocean" , "Ocean area" , "It's stocked with fish" , "The deep" .)

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