The French boy's Bible reading (6)
I believe the answer is:
lesson
'bible reading' is the definition.
(I've seen this before)
'the french boy's' is the wordplay.
'the french' becomes 'les' (les is the in french).
'boy' becomes 'son' ('son' can be a synonym of 'boy'**).
'les'+'son'='LESSON'
(Other definitions for lesson that I've seen before include "Portion of the scriptures read in church" , "What teacher provides" , "Cautionary tale" , "Period of learning" , "A session in school or an example" .)