Crossword Genius

Rules of conduct; cipher (4)

Ross

I believe the answer is:

code

(Other definitions for code that I've seen before include "Secret system of letters. words etc" , "Kind of encryption designed to disguise content" , "Secret language" , "Computing instructions" , "Playfair is one" .)

I've seen this clue in the Sydney Morning Herald.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.