Storybook monster (4)
I believe the answer is:
ogre
'storybook monster' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ogre that I've seen before include "Cruel, fearsome person" , "Giant of folklore who ate humans" , "Terrifying giant" , "Terrifying man" , "Evil giant" .)