Lycanthrope (8)
I believe the answer is:
werewolf
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lycanthrope</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for werewolf that I've seen before include "Scarily unpredictable type" , "Person who becomes a monster when the moon is full" , "It's fabulous" , "Lycanthrope, shape changer" , "man going wild occasionally" .)