Primary school teacher (6)
I believe the answer is:
master
This clue might be a double definition.
'primary' is the first definition.
(I know that primary can be written as master)
'school teacher' is the second definition.
'master' can be an answer for 'teacher' (I've seen this before). I am unsure of the 'school' bit.
Can you help me to learn more?
(Other definitions for master that I've seen before include "Expert" , "Overcome; original copy" , "Overcome; original film" , "Schoolteacher" , "An old one is one of the early and great European painters" .)