Intercourse not over for church officer (6)

I believe the answer is:

sexton

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'for church officer' is the definition.
(sexton is a kind of church officer)

'intercourse not over' is the wordplay.
'intercourse not' becomes 'sext' (I am not sure about this - if you are sure you should believe this answer much more).
'over' becomes 'on' (physically on top of).
'sext'+'on'='SEXTON'

Can you help me to learn more?

(Other definitions for sexton that I've seen before include "He arranges the grave" , "Church functionary" , "Church official" , "Officer of the church on the Irish rugby team?" , "One is responsible for church building" .)

I've seen this clue in the Sydney Morning Herald.

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