Possible Clues:

• Teacher that goes strictly by the book
• One overly concerned with appendage for foot soldier?
• Bookish egghead
• Particular type preferred to accommodate desperate character
• One particular quadruped anteater can eat
• Stickler for trivial detail
• Stickler for trifles
• One who insists on minor details, may be a conceited know-all
• Long to bypass editor, one of the old school?
• Academic stickler