Pork portion (4)
I believe the answer is:
loin
'pork portion' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for loin that I've seen before include "Part of a carcase" , "Part of the back - cut of meat" , "Part of the body to which "lumbar" refers" , "Lumbar region" , "Joint of meat" .)