In being fed, this animal is enclosed (3)
I believe the answer is:
ram
'in being fed this animal is enclosed' is the definition.
'ram' can be an answer for 'animal' (male sheep). I'm not sure about the remainder of the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for ram that I've seen before include "Strike violently" , "Computers need it to operate" , "man with many partners?" , "Crash into, maybe for battering" , "Zodiac sign; piston" .)