Socialist later revised warning (3,5)

I believe the answer is:

red alert

(Other definitions for red alert that I've seen before include "State of readiness for imminent crisis" , "Danger sign" , "Severe warning" , "State of readiness for imminent threat" , "High crisis level" .)

I've seen this clue in The Sun.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.