Crossword Genius

Conclusion delayed in mixed set of rules (4)

Ross

I believe the answer is:

code

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'set of rules' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for code that I've seen before include "Ethical standards" , "what's character-changing?" , "See 12" , "Secret system of letters. words etc" , "System of ethics - cipher" .)

I've seen this clue in the Sydney Morning Herald.
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