Girl, a learner, getting book in church (6)
I believe the answer is:
missal
'book in church' is the definition.
'missal' can be an answer for 'book' (I've seen this before). I'm not sure about the 'in church' bit.
'girl a learner getting' is the wordplay.
'girl' becomes 'missa' (I am not sure about this - if you are sure you should believe this answer much more).
'a learner' becomes 'l'.
'getting' is a charade indicator (letters next to each other).
'missa'+'l'='MISSAL'
Can you help me to learn more?
(Other definitions for missal that I've seen before include "Book used at Catholic mass" , "book needed to get through service" , "Book of texts for the Catholic Mass" , "A book of prayers used in mass" , "Prayer book for th Catholic mass" .)