Selfishly keep pig (3)
I believe the answer is:
hog
I believe this clue is a double definition.
'selfishly keep' is the first definition.
(I've seen this before)
'pig' is the second definition.
(I know that hog parent taxon pig)
(Other definitions for hog that I've seen before include "Domesticated pig" , "Take more than one's share" , "Porker" , "A male pig or a greedy person" , "Pig; hoard selfishly" .)