Exaggerator of danger (8)
I believe the answer is:
alarmist
'exaggerator of danger' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for alarmist that I've seen before include "Worrying individual" , "flapping excessively" , "Scary" , "Scaremonger - the boy who cried wolf was one" , "Exaggerator of danger" .)