Animal in the middle? (3)
I believe the answer is:
pig
'animal' is the definition.
(pigs are animals)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for pig that I've seen before include "Eat greedily" , "Glutton" , "& 16 Animal pen" , "Farmyard animal" , "person who eats too much" .)