Something to hunt with - or hunt for (6)
I believe the answer is:
ferret
'hunt for' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for ferret that I've seen before include "Tame polecat" , "Diligent searcher" , "Small fierce animal good for catching rabbits" , "Animal bred for hunting rats and rabbits" , "It drives rabbits from their holes" .)