Crossword Genius

Sinking signal (3)

Ross

I believe the answer is:

sos

(Other definitions for sos that I've seen before include "Emergency message" , "Call for help" , "Help initially, Mr Morse" , "Morse Code for help" , "Help code in 13 Across" .)

I've seen this clue in the King Feature Syndicate and The Wall Street Journal.
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