Keep to oneself? (3)
I believe the answer is:
hog
'keep to oneself?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hog that I've seen before include "Pig, who holds the road perhaps" , "Swine - keep for oneself" , "Greedy person or pig for slaughter" , "Gourmand" , "Take more than one's share" .)