Furry animal, feline, one devouring duck (5)
I believe the answer is:
coati
'furry animal' is the definition.
(I've seen this before)
'feline one devouring duck' is the wordplay.
'feline' becomes 'cat' (I've seen this before).
'one' becomes 'i' (Roman numeral).
'devouring' indicates putting letters inside.
'duck' becomes 'o'.
'cat'+'i'='cati'
'cati' placed around 'o' is 'COATI'.
(Other definitions for coati that I've seen before include "American denizen" , "omnivorous mammal" , "Furry animal" , "consumer of flesh" , "Kind of raccoon" .)