Pig, swine (3)
I believe the answer is:
hog
This clue is a double definition.
'pig' is the first definition.
(synonyms)
'swine' is the second definition.
(hog is a kind of swine)
(Other definitions for hog that I've seen before include "Domesticated pig" , "Porker" , "Selfishly keep" , "Pig, who holds the road perhaps" , "source of meat" .)