Lack of awareness in church sheltering good girl (9)
I believe the answer is:
ignorance
'lack of awareness' is the definition.
(I've seen this before)
'in church sheltering good girl' is the wordplay.
'church' becomes 'CE' (Church of England).
'sheltering' indicates putting letters inside.
'good' becomes 'g' (abbreviation).
'girl' becomes 'nora' (girl's name).
'in'+'ce'='ince'
'g'+'nora'='gnora'
'ince' placed around 'gnora' is 'IGNORANCE'.
(Other definitions for ignorance that I've seen before include "State of unknowing" , "bliss, they say" , "Lack of knowledge" , "may be considered bliss" , "being uninformed" .)