Vin rouge? It's not for consumption when driving on public roads (3,6)

I believe the answer is:

red diesel

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'public roads' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'vin rouge? it's not for consumption when driving on' is the wordplay.
I cannot really see how this works, but
'it's' could be 'es' ('e' can mean 'electronic' which is similar to 'IT') and 'es' is found in the answer.
'on' could be 're' ('on' can be mean 'with reference to') and 're' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.

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