A freshwater carnivorous musteline mammal such as Lutra lutra (5)

I believe the answer is:

otter

(Other definitions for otter that I've seen before include "Fur possibly" , "Freshwater carnivorous mammal with webbed and clawed feet" , "Tarka, for one" , "Carnivorous aquatic mammal" , "Sleek river mammal" .)

I've seen this clue in The Independent.

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