Vile wine-lover; a glutton naturally (9)
I believe the answer is:
wolverine
'a glutton naturally' is the definition.
I can't tell whether this definition defines the answer.
'vile wine-lover' is the wordplay.
'wine-lover' anagrams to 'WOLVERINE'.
However, I am unsure how this is indicated.
Can you help me to learn more?
(Other definitions for wolverine that I've seen before include "Wild animal, also known as glutton" , "wild beast" , "Evil owner of lupine female" , "Large carnivore" , "Large forest mammal - North American glutton" .)