You could seek one out as a pet (6)

I believe the answer is:

ferret

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'a pet' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ferret that I've seen before include "Rabbit-hunting polecat" , "Animal used to catch rabbits" , "Domesticated variety of polecat" , "Rummage" , "Root around" .)

I've seen this clue in the Evening Standard.

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