Possible Clues:

• Slip spotter
• A major role of one type of sub
• Principal lecturer ringing old senior lecturer, one who a publisher employs?
• Text checker
• A malefactor who atones for making your writing nonsense by permitting the compositor to make it unintelligible
• One checks document adjusted for page order after third of figures is erased
• Publisher's employee who sorts out some letters?
• Member of the math faculty, at times?
• Editor/geometry teacher
• Two academics conceal love for one marking scripts