Killer whale (4)

I think it could be either:

Which length description are you looking for?:

grampus

'killer whale' is the definition.
(synonyms)

This is all the clue.

(Other definitions for grampus that I've seen before include "Good synchronised swimmer" , "huge creature" , "Popular name for a killer whale" , "danger in the main" , "Dolphin - killer whale" .)

I've seen this clue in the Sydney Morning Herald.

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