Declare love and primarily respect teacher (9)
I believe the answer is:
professor
'teacher' is the definition.
(I know that teacher can be written as professor)
'declare love and primarily respect' is the wordplay.
'declare' becomes 'profess' (professing is a kind of declaring).
'love' becomes 'o' (love means zero in tennis).
'and' means one lot of letters go next to another.
'primarily' says to take the initial letters.
The first letter of 'respect' is 'r'.
'profess'+'o'+'r'='PROFESSOR'
(Other definitions for professor that I've seen before include "Leading academic" , "One affirming faith" , "University lecturer" , "chairman?" , "Senior member of college faculty" .)