Mammal with the densest fur (5)

I believe the answer is:

otter

(Other definitions for otter that I've seen before include "Something furry" , "furry creature" , "Fish-eater of the weasel family" , "Aquatic beast" , "Playful aquatic animal of 'Tarka' fame" .)

I've seen this clue in The Wall Street Journal.

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