Disturbing (8)
'disturbing' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for alarming that I've seen before include "Disturbing, frightening" , "causing fright" , "Fearsome" , "Frightening or warning of danger" , "Dangerous" .)
'disturbing' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Another definition for unsettling that I've seen is " Disturbing".)