Monster of the deep (6)

I believe the answer is:

kraken

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

I've seen this clue in the Universal.

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