Crossword Genius

Firebrand puts key for me in Rolls-Royce (8)

Ross

I believe the answer is:

reformer

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'firebrand' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'key for me in rolls-royce' is the wordplay.
'key' becomes 'e' (musical key).
'in' is an insertion indicator.
'rolls royce' becomes 'rr' (short for Rolls Royce).
'e'+'for'+'me'='eforme'
'eforme' placed inside 'rr' is 'REFORMER'.

'puts' acts as a link.

Can you help me to learn more?

(Other definitions for reformer that I've seen before include "One changing for the better" , "eg Luther" , "Person who advocates change" , "One who changes organisation in order to improve" , "Luther, perhaps" .)

I've seen this clue in The Sun.
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