A half-tamed albino variety of the polecat, used to unearth rabbits (6)

I believe the answer is:

ferret

(Other definitions for ferret that I've seen before include "European polecat bred for hunting rabbits" , "Animal bred for hunting rats and rabbits" , "Find (out) by persistent investigation" , "Domesticated variety of polecat" , "Type of polecat -- or silk binding tape" .)

I've seen this clue in The Independent.

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