Monstrosity (5)
I believe the answer is:
freak
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">monstrosity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for freak that I've seen before include "Eccentric" , "Weirdo" , "Monstrosity" , "Abnormality" , "Abnormal creature" .)