Monstrous (7)
I believe the answer is:
ogreish
'monstrous' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ogreish that I've seen before include "Terrifyingly big" , "Cruel and terrifying" , "Monstrous, misshapen, cruel" , "Like a cruel monster" , "Fearsome" .)