Cadet in conflict with our teacher (8)
I believe the answer is:
educator
'teacher' is the definition.
(someone who educates)
'cadet in conflict with our' is the wordplay.
'in conflict with' indicates anagramming the letters (I've seen this in other clues).
'cadet' anagrammed with 'our' makes 'EDUCATOR'.
(Other definitions for educator that I've seen before include "master, say" , "coach" , "school worker" , "One who teaches others" , "mistress, say" .)