Whalebone whale (7)

I believe the answer is:

rorqual

'whalebone whale' is the definition.
(rorqual is a kind of whalebone whale)

This is all the clue.

(Other definitions for rorqual that I've seen before include "Finback whale" , "Sea creature" , "Large baleen whale" , "Great swimmer" , "Toothless creature" .)

I've seen this clue in The Independent.

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