Search for animal (6)

I believe the answer is:

ferret

I believe this is a double definition.

'search for' is the first definition.
(I've seen this before)

'animal' is the second definition.
(I've seen this before)

(Other definitions for ferret that I've seen before include "Small weasel good at hunting rabbits" , "Jill perhaps" , "Fierce little animal used in rabbit hunting" , "Assiduous searcher" , "Weasel-like animal" .)

I've seen this clue in The Mirror.

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