Write article on church as form of atonement (7)

I believe the answer is:

penance

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'form of atonement' is the definition.
'penance' can be an answer for 'atonement' (I've seen this before). I'm not sure about the 'form of' bit.

'write article on church' is the wordplay.
'write' becomes 'pen' (synonyms).
'article' becomes 'an' (English indefinite article).
'on' says to put letters next to each other.
'church' becomes 'CE' (abbreviation for Church of England).
'pen'+'an'+'ce'='PENANCE'

'as' acts as a link.

Can you help me to learn more?

(Other definitions for penance that I've seen before include "act of self-punishment" , "humiliating act" , "Self-imposed punishment" , "Act of contrition" , "sacrament" .)

I've seen this clue in The Telegraph.

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