Barbarous (7)
(Other definitions for ogreish that I've seen before include "Like a cruel monster" , "Ugly" , "Fearsome" , "Cruel and terrifying" , "Monstrous, misshapen, cruel" .)
'barbarous' is the definition.
(synonyms)
This is all the clue.
(Other definitions for cruel that I've seen before include "Merciless" , "Painful" , "Diabolical" , "Inflicting pain and feeling no concern" , "Sadistic, causing suffering" .)