Teacher's ___ (3)
'teachers' is the definition.
(I know this)
This is the entire clue.
(Other definitions for tutors that I've seen before include "Teachers of individuals or small groups" , "Mentors" , "Private instructors" , "Private teachers for students" , "Coaches" .)
(Another definition for educationalists that I've seen is " Certain specialists".)
(Other definitions for pet that I've seen before include "Favourite, favoured one" , "Favourite - maybe teacher's" , "blue-eyed boy?" , "Domesticated animal" , "Favourite or house animal" .)