Chilling (5)
'chilling' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eerie that I've seen before include "Spooky, unearthly" , "Sinister" , "Weird and disturbing" , "Ghostly" , "Weird, uncanny" .)
(Other definitions for creepy that I've seen before include "Mysterious" , "Spooky" , "Disturbing, crawly" , "Frightening or disturbing" , "Causing feelings of fear or repulsion" .)