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 Universal, the LA Times, the King Feature Syndicate, the Sydney Morning Herald, The Wall Street Journal, The New York Times, The Telegraph and the Canadiana.
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