Correctness of notes on church office (8)
I believe the answer is:
accuracy
'correctness' is the definition.
(accuracy is a kind of correctness)
'notes on church office' is the wordplay.
'notes' becomes 'ac'.
'on' means one lot of letters go next to another.
'church office' becomes 'curacy' (I've seen this before).
'ac'+'curacy'='ACCURACY'
'of' acts as a link.
(Other definitions for accuracy that I've seen before include "Absolute correctness" , "Correctness - exactitude" , "fidelity" , "Correctness, nearness to truth" , "Precision of detail" .)