Prophetic sign, omen (7)
I believe the answer is:
portent
This clue is a double definition.
'prophetic sign' is the first definition.
(I've seen this before)
'omen' is the second definition.
(I know that omen can be written as portent)
(Other definitions for portent that I've seen before include "Warning of momentous event" , "Prophetic sign" , "Sign, omen" , "Augury" , "Foreboding" .)