A legendary sea monster of gigantic size believed to dwell off the coast of Norway (6)

I believe the answer is:

kraken

(Other definitions for kraken that I've seen before include "Mythical sea-monster off Norway's coast" , "Sea monster that sleepeth (Tennyson)" , "The -- Wakes (John Wyndham)" , "A legendary sea monster of Norwegian myth" , "Mythical sea monster (Norway)" .)

I've seen this clue in The Independent.

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