Hob (male) or jill (female) (6)

I believe the answer is:

ferret

(Other definitions for ferret that I've seen before include "Small fierce animal, rabit hunter" , "Animal to hunt rats and rabbits" , "Small fierce animal used to hunt rabbits" , "Assiduous searcher" , "Domesticated variety of polecat" .)

I've seen this clue in The Guardian.

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