Creepiness (8)
I believe the answer is:
eeriness
'creepiness' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for eeriness that I've seen before include "'Weirdness, scariness (8)'" , "Horror movie featuring such" , "'Ghostliness, scariness (8)'" , "Ghostly quality" , "Is serene (anag.)" .)