Killer whale (4)

I think it could be either:

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7 4*

'killer whale' is the definition.
(synonyms)

This is all the clue.

(Other definitions for orca that I've seen before include "Sea creature" , "Large mammal" , "ship" , "Killer in deep" , "Marine creature" .)

I've seen this clue in The Mirror, The New York Times, The Times, the Universal, The Wall Street Journal, the USA Today, the King Feature Syndicate, the LA Times, The Irish Times, The Guardian, the Sydney Morning Herald, The Telegraph and the Penny Press.

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