Glossy brown fur
I believe the answer is:
otter
'glossy brown fur' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for otter that I've seen before include "Aquatic river mammal" , "Holt dweller" , "Aquatic weasel-like mammal" , "River animal" , "eg Tarka" .)