Fur covering one carnivorous mammal (5)
I believe this is a triple definition!
'fur' is the first definition.
(I know that otter is a fur)
'covering' is the second definition.
(otter is a kind of covering)
'one carnivorous mammal' is the third definition.
(I've seen this before)
(Other definitions for otter that I've seen before include "Sleek river mammal" , "Something furry" , "Fur possibly" , "one that eats fish" , "Good swimmer" .)
'carnivorous mammal' is the definition.
(I know this)
'fur covering one' is the wordplay.
'fur' becomes 'coat' (an animal's coat).
'covering' says to put letters next to each other (in a down clue, some letters go on top of others).
'one' becomes 'i' (Roman numeral).
'coat'+'i'='COATI'
(Other definitions for coati that I've seen before include "Racoon-like omnivorous creature of Central and South America" , "Furry animal" , "Plantigrade carnivore" , "omnivorous mammal" , "American denizen" .)