Innocence I found in part of church, note (7)
I believe the answer is:
naivete
'innocence' is the definition.
(thesaurus)
'i found in part of church note' is the wordplay.
'found in' is an insertion indicator.
'part of church' becomes 'nave' ('nave' is part of 'church').
'note' becomes 'te' (**).
'i' put inside 'nave' is 'naive'.
'naive'+'te'='NAIVETE'
(Other definitions for naivete that I've seen before include "natural simplicity" , "lack of experience" , "Being green" , "Innocence, artlessness" , "Quality of innocent gullibility" .)