Monopolise (3)
I believe the answer is:
hog
'monopolise' 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 "Swine - keep for oneself" , "Pig, who holds the road perhaps" , "Pig reared for slaughter" , "Porker" , "Take more than one's share" .)