Warning sign (3,4)

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4 7

3,4

red flag

'warning sign' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for red flag that I've seen before include "The ... ..., anthem of the British Labour Party" , "Emblem of socialist revolution or danger" , "A number of revolutionaries" , "Warning signal" , "Emblem of socialism" .)

I've seen this clue in The Times and The Guardian.

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