Religious offices may see mostly prudish discourses (9)

I believe the answer is:

priorates

'religious offices' is the definition.

'mostly prudish discourses' is the wordplay.
'mostly' means to remove the last letter.
'prudish' becomes 'prim' ('prim' can be a synonym of 'prudish').
'discourses' becomes 'orates'.
'prim' with its final letter removed is 'pri'.
'pri'+'orates'='PRIORATES'

'may see' is the link.

I've seen this clue in The Telegraph.

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