Oppressor (4)
(Other definitions for ogre that I've seen before include "Bogeyman" , "Fierce giant" , "Fairy tale monster" , "Bugbear" , "Man-eating monster of fairy tales" .)
'oppressor' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for bully that I've seen before include "Tinned beef" , "Browbeater" , "Playground thug" , "Intimidating person" , "One torments weaker people" .)