Better scripture class (6)

I believe the answer is:

reform

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'better' is the definition.
(reforming is a kind of bettering)

'scripture class' is the wordplay.
'scripture' becomes 're' (I can't justify this - if you can you should give a lot more credence to this answer).
'class' becomes 'form' (synonyms).
're'+'form'='REFORM'

Can you help me to learn more?

(Other definitions for reform that I've seen before include "Correct(ion of) abuses" , "Show improvement" , "Mend one's ways" , "Go straight" , "Abandon evil practices" .)

I've seen this clue in The Telegraph.

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