"Release the ___!" (cry to unleash a mythical beast) (6)

I believe the answer is:

kraken

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

I've seen this clue in The Washington Post.

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