Crossword Genius

Predator on a continental shelf (3)

Ross

I believe the answer is:

eel

(Other definitions for eel that I've seen before include "Creature like conger or moray" , "Slender fish" , "Ribbon-like fish" , "Slippery person" , "Sea creature like conger" .)

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