Crossword Genius

Modus operandi (6)

Ross

I believe the answer is:

system

(Other definitions for system that I've seen before include "Arrangement of parts functioning together" , "Organised whole made up of related parts" , "A complete process" , "Organized scheme" , "Functioning set of interactive parts" .)

I've seen this clue in the LA Times, the Sydney Morning Herald and the Newsday.
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