Hog enclosure (3)
I believe the answer is:
sty
'hog enclosure' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sty that I've seen before include "Pig pen" , "Pigpen; swelling" , "Pig home or eye sore" , "Animal pen" , "Sore on eyelid" .)