Arctic whale (7)

I think it could be either:

narwhal

bowhead

'arctic whale' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for narwhal that I've seen before include "Small Arctic whale" , "Warn Hal there's a whale here" , "Small tusked whale" , "Marine mammal, the male having a spiral ivory tusk" , "beast" .)

I've seen this clue in The Telegraph, the Sydney Morning Herald and The Independent.

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