In a spooky way (6)
I believe the answer is:
eerily
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in a spooky way</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eerily that I've seen before include "In strange or unearthly way" , "In a spooky way" , "in a disturbing way" , "in a weird way" , "In a strange and frightening way" .)