Crossword Genius

Killer whales (5)

Ross

I believe the answer is:

orcas

'killer whales' is the definition.
('orca' can be a synonym of 'killer whale')

This is all the clue.

(Other definitions for orcas that I've seen before include "Killers" , "Killer whales" .)

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