Crossword Genius

Secret writing (4)

Ross

I believe the answer is:

code

'secret writing' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for code that I've seen before include "System used to disguise or represent words, like Morse" , "Secret system of letters. words etc" , "Eg, Morse" , "Program instructions" , "Secret symbols" .)

I've seen this clue in the Newsday, the Penny Press and the King Feature Syndicate.
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