Motown maestro direct about idea on Detroit to start with (6,6)

I believe the answer is:

stevie wonder

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'motown maestro direct about idea' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'on detroit to start with' is the wordplay.
I cannot really understand how this works, but
'on' is present in the answer.
'with' could be 'w' (abbreviation) and 'w' is present in the answer.
This explanation may well be incorrect...

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I've seen this clue in The Independent.

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