Cruel fairytale giant (4)
I believe the answer is:
ogre
'cruel fairytale giant' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ogre that I've seen before include "character in 'Puss in Boots'" , "Terrifying giant" , "Fairy tale monster" , "Giant who eats people" , "Monstrous person" .)