Spooky condition (8)
I believe the answer is:
eeriness
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spooky condition</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for eeriness that I've seen before include "Ghostly quality" , "'Weirdness, scariness (8)'" , "Is serene (anag.)" , "Weird quality" , "Horror movie featuring such" .)