Aquatic apex predator (4)

I believe the answer is:

orca

'aquatic apex predator' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for orca that I've seen before include "Killer at sea" , "swimmer in black and white" , "Large predator" , "grampus" , "Cor! a killer whale" .)

I've seen this clue in The Wall Street Journal, The Washington Post Sunday, the USA Today and The Chronicle of Higher Education.

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