Notifies (6)
I believe the answer is:
alerts
'notifies' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alerts that I've seen before include "Warnings" , "Puts on guard, warns about impending danger" , "Puts on guard, forewarns" , "Draws attention to, a danger perhaps" , "danger-signals" .)