Crossword Genius

Note preceding Martin Luther? (8)

Ross

I believe the answer is:

reformer

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'luther?' is the definition.
(I've seen this before)

'note preceding martin' is the wordplay.
'note' becomes 're' (as in do-re-mi).
'preceding martin' becomes 'former' (I can't justify this - if you can you should give a lot more credence to this answer).
're'+'former'='REFORMER'

Can you help me to learn more?

(Other definitions for reformer that I've seen before include "One who changes or improves, say, an organisation" , "One dealing with abuses" , "Luther, for one" , "campaigner for change" , "Luther, perhaps" .)

I've seen this clue in The Sun.
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