Creature less cold in East End (5)

I believe the answer is:

otter

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'creature' is the definition.
(I know that otter is a type of creature)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for otter that I've seen before include "Semi-aquatic creature" , "Good swimmer" , "Torte (anag)" , "Water animal with webbed fee, brown fur and flat tail" , "Water-loving animal" .)

I've seen this clue in The Mirror.

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