Religious Education on page monks, say, reserve in advance (8)

I believe the answer is:

preorder

'reserve in advance' is the definition.

'religious education on page monks' is the wordplay.
'religious education' becomes 're'.
'on' means one lot of letters go next to another.
'page' becomes 'p'.
'monks' becomes 'order'.
're' after 'p' is 'pre'.
'pre'+'order'='PREORDER'

'say' is the link.

(Another definition for preorder that I've seen is " Reserve (something) before it's available".)

I've seen this clue in The Times.

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