Domesticated European polecat (6)
I believe the answer is:
ferret
'domesticated european polecat' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ferret that I've seen before include "Search; type of polecat" , "European polecat bred for hunting rabbits" , "It's used to drive rabbits from their holes" , "Small polecat" , "Small fierce animal used to hunt rabbits" .)