A mix of hate and respect for favoured pupil (8,3)
I believe the answer is:
teachers pet
'favoured pupil' is the definition.
(I've seen this before)
'a mix of hate and respect' is the wordplay.
'a mix of' indicates anagramming the letters.
'and' says to put letters next to each other.
'hate' after 'respect' is 'respecthate'.
'respecthate' is an anagram of 'TEACHERS PET'.
'for' acts as a link.
(Other definitions for teachers pet that I've seen before include "Favourite in form" , "goody-goody" , "Student of form favoured" , "Class favourite" , "Least popular child in the class?" .)