Monstrous giant (4)
I believe the answer is:
ogre
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">monstrous giant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ogre that I've seen before include "Monstrous person" , "Cruel giant of folklore" , "Ugly giant" , "Giant who eats people" , "Man-eating monster of fairy tales" .)