Crossword Genius

River mammal (5)

Ross

I believe the answer is:

otter

'river mammal' 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 "Semi-aquatic mammal" , "Good swimmer" , "Holt dweller" , "Tarka, for one" , "Freshwater carnivorous mammal with webbed and clawed feet" .)

I've seen this clue in the Penny Press, The Sun, The Telegraph, The Times and The Mirror.
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