Ferret (7)
I believe the answer is:
polecat
'ferret' is the definition.
(I know that ferret can be written as polecat)
This is the entire clue.
(Other definitions for polecat that I've seen before include "Smelly American mammal" , "weaselly creature" , "Weasel-like creature" , "Weasel-like mammal" , "weaselly type" .)