A call for help (3)

I believe the answer is:

sos

'a call for help' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for sos that I've seen before include "Call for help" , "Coded distress signal" , "Morse Code for help" , "plea" , "urgent appeal" .)

I've seen this clue in the Evening Standard and The New York Times.

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