Warnings from realist sadly I ignored (6)
I believe the answer is:
alerts
'warnings' is the definition.
(alert is a kind of warning)
I cannot understand how the rest of the clue works.
(Other definitions for alerts that I've seen before include "Puts on guard, forewarns" , "Puts on guard, warns about impending danger" , "Warns, draws attention to" , "Draws attention to, a danger perhaps" , "Alarms, warning signals" .)