Feature cool American animal (10)
I believe the answer is:
chinchilla
'animal' is the definition.
(chinchilla is a kind of animal)
'feature cool american' is the wordplay.
'feature' becomes 'chin' (chin is a kind of feature).
'cool' becomes 'chill' (synonyms).
'american' becomes 'a' (common abbreviation - e.g. in organisation names).
'chin'+'chill'+'a'='CHINCHILLA'
(Other definitions for chinchilla that I've seen before include "furry creature" , "Rabbit" , "Soft grey fur" , "little furry animal" , "(Fur of) a small South American rodent" .)