Naivete (9)
I believe the answer is:
innocence
'naivete' is the definition.
(I know that innocence is a type of naivete)
This is the entire clue.
(Other definitions for innocence that I've seen before include "Uncorrupted state" , "Lack of guilt" , "lack of conviction" , "Naivety" , "Guilelessness" .)