Set cost to correct reverend, if occasionally straying (5,3)

I believe the answer is:

fixed fee

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'set cost' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'correct reverend if occasionally straying' is the wordplay.
'correct' becomes 'fix' (fix can mean to improve or correct).
'occasionally' indicates alternate letters.
'straying' indicates an anagram.
'reverend'+'if'='reverendif'
The alternating letters of 'reverendif' are 'eeedf'.
'eeedf' with letters rearranged gives 'edfee'.
'fix'+'edfee'='FIXED FEE'

'to' is the link.

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

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