Good book for teacher and a pupil (6)
I believe the answer is:
missal
'good book' is the definition.
'missal' can be an answer for 'book' (I've seen this before). I am not certain of the 'good' bit.
'teacher and a pupil' is the wordplay.
'teacher' becomes 'miss' (a female teacher might be addressed 'miss').
'and' means one lot of letters go next to another.
'pupil' becomes 'L' (as in a learner driver with L-plates on their car).
'miss'+'a'+'l'='MISSAL'
'for' is the link.
Can you help me to learn more?
(Other definitions for missal that I've seen before include "Prayer-book" , "A book of prayers used in mass" , "Mass medium" , "Catholic mass text book" , "guide for the services" .)