Idiot; animal (3)
I believe the answer is:
ass
I believe this clue is a double definition.
'idiot' is the first definition.
(I've seen this before)
'animal' is the second definition.
(term for a donkey)
(Other definitions for ass that I've seen before include "Bottom, temporarily" , "One easily had" , "Wally" , "Dipstick" , "twit!" .)