Ring-tailed mammal (7)
I believe the answer is:
raccoon
'ring-tailed mammal' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for raccoon that I've seen before include "Small N American mammal" , "Omnivorous nocturnal mammal native to N and C America" , "North American omnivore" , "American nocturnal mammal" , "US nocturnal mammal" .)