Animal, partly domesticated (3)
I believe the answer is:
cat
'animal' is the definition.
(cats are animals)
'partly domesticated' is the wordplay.
'partly' says the answer is hidden in the clue (part of the clue is used).
'CAT' can be found hidden inside 'domesticated'.
(Other definitions for cat that I've seen before include "eg Leopard" , "Eg, tiger, lion" , "Domestic animal" , "Tabby" , "Animal (domesticated or wild)" .)