Swine decapitated water creature (5)

I believe the answer is:

otter

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'water creature' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for otter that I've seen before include "Fish-eater of the weasel family" , "furry creature" , "River animal" , "Something furry" , "fish-eater displayed" .)

I've seen this clue in The Telegraph.

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