Spooky sightings (4)
I believe the answer is:
ufos
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spooky sightings</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ufos that I've seen before include "Initially and formally, flying saucers" , "Mysterious phenomena" , "Initially, official flying saucers" , "Potential alien craft" , "Initially, formal flying saucers" .)