1977 film about a killer whale starring Richard Harris and Charlotte Rampling (4)

I believe the answer is:

orca

(Other definitions for orca that I've seen before include "Danger for swimmers" , "27 [WHALE]" , "Killer in deep" , "Predatory black and white toothed whale" , "swimmer in black and white" .)

I've seen this clue in The Independent.

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