Search; type of polecat (6)
I believe the answer is:
ferret
I believe this clue is a double definition.
'search' is the first definition.
(ferret can mean to search around for something)
'type of polecat' is the second definition.
(I've seen this in another clue)
(Other definitions for ferret that I've seen before include "Diligent searcher" , "Jill perhaps" , "It digs out rabbits" , "European polecat bred for hunting rabbits" , "Weasel-like animal" .)