Horror (6)
I believe the answer is:
terror
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">horror</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for terror that I've seen before include "Little brat" , "Paralysing fear" , "consternation" , "State of extreme fright" , "(What causes) panic" .)