Spookiness (8)
I believe the answer is:
eeriness
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spookiness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eeriness that I've seen before include "Weird quality" , "Ghostly quality" , "Ghostly atmosphere" , "Strange and frightening quality" , "Is serene (anag.)" .)