"Free Willy" whale (4)

I believe the answer is:

orca

'free willy whale' 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 "Cor! a killer whale" , "Large mammal" , "Marine creature" , "Killer at sea" , "Massive killer" .)

I've seen this clue in the Family Time, The New York Times, the Universal and the USA Today.

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