Crossword Genius

Not a nice message to send (3)

Ross

I believe the answer is:

sos

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for sos that I've seen before include "International distress code" , "Call for help" , "Emergency message" , "Morse Code for help" , "Appeal for help" .)

I've seen this clue in the Evening Standard.
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