Sinner opening House of God (7)

I believe the answer is:

convent

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'house of god' is the definition.
'convent' can be an answer for 'house' (convent is a kind of house). I am unsure of the 'of god' bit.

'sinner opening' is the wordplay.
'sinner' becomes 'con' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'opening' becomes 'vent' (a vent is an opening or outlet).
'con'+'vent'='CONVENT'

Can you help me to learn more?

(Other definitions for convent that I've seen before include "place for nuns" , "Community of nuns" , "Building for prayer" , "Building for nuns" , "Religious house" .)

I've seen this clue in The Guardian.

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