Fairy tale menace
I believe the answer is:
ogre
'fairy tale menace' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ogre that I've seen before include "Wicked giant" , "Giant of folklore who ate humans" , "Ergo (anag.)" , "Grim(m) beast?" , "Terrifying monster" .)