Crossword Genius

Naivety of establishment at some point concealing church (9)

Ross

I believe the answer is:

innocence

I'm a little stuck... Click here to teach me more about this clue!

'naivety of establishment' is the definition.
'innocence' can be an answer for 'naivety' (innocence is a kind of naivety). I'm unsure of the 'of establishment' bit.

'at some point concealing church' is the wordplay.
'at' becomes 'in'.
'some point' becomes 'nonce' (I can't justify this - if you can you should give a lot more credence to this answer).
'concealing' is an insertion indicator.
'church' becomes 'ce' (abbreviation for Church of England).
'nonce' enclosing 'ce' is 'nocence'.
'in'+'nocence'='INNOCENCE'

Can you help me to learn more?

(Other definitions for innocence that I've seen before include "lack of conviction" , "Guilelessness" , "Uncorrupted state" , "Naivety" , "Honesty" .)

I've seen this clue in The Times.
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