Strange and disturbing (5)
I believe the answer is:
eerie
'strange and disturbing' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for eerie that I've seen before include "Spooky, weird" , "Strangely frightening" , "Bloodcurdling" , "Strange and disturbing" , "Spooky, supernatural" .)