Changes statement claiming success of divinity course? (7)

I believe the answer is:

reworks

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'changes statement' is the definition.
Although both the answer and definition are verbs in their -s form, I can't see how they can define each other.

'claiming success of divinity course?' is the wordplay.
'claiming' means one lot of letters goes inside another.
'success of' becomes 'work' (I can't justify this - if you can you should give a lot more credence to this answer).
'divinity' becomes 'Re' (Re is an example).
'course?' becomes 's'.
're'+'s'='res'
'work' put within 'res' is 'REWORKS'.

Can you help me to learn more?

I've seen this clue in The Independent.

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