Dogmatic teacher
I believe the answer is:
pedant
'dogmatic teacher' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pedant that I've seen before include "Nitpicker" , "Panted like stickler for accuracy" , "Panted like dogmatist" , "Particular type" , "One is overly-concerned with detail" .)