Emblem of danger (3,4)

I think it could be either:

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3,4

red flag

'emblem 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 "Socialist symbol" , "Warning signal" , "Danger warning" , "Revolutionary symbol and song to the tune of Tannenbaum" , "Emblem of socialist revolution or danger" .)

I've seen this clue in The Irish Times.

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