Warning of danger (3,4)
There are a few possibilities for this:
red flag
'warning of danger' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for red flag that I've seen before include "Sign of danger - sign of socialism" , "left-wing message?" , "Left-wing symbol" , "The ... ..., anthem of the British Labour Party" , "Instruction to halt" .)
'warning of danger' is the definition.
(an alarm alerts you to danger)
This is the entire clue.
(Other definitions for alarm that I've seen before include "Announcement of danger" , "Safety bell or alert signal" , "Agitate" , "Warning bell" , "Fright" .)
'warning of danger' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for alert that I've seen before include "Vigilantly attentive" , "Wide awake and watchful" , "Watchful and observant" , "Watchful; warning" , "Quick to notice" .)