Possible Clues:

• Method of working
• Habitual procedure
• Practice initially shared with a medical officer
• Particular way of doing something (Latin)
• Duo promised an unusual way of working
• Plan of action, as "initially" found in the answers to the starred clues?
• Service chiefs (American) work with ruler and current procedure
• Embracing love, Superman did nothing to change his routine
• Cracking upside with doorman -- this shows how it's done
• Method of working revealed by fishmonger, essentially