Mineral producing road waste? (4,5)

I believe the answer is:

soda water

'mineral' is the definition.

'producing road waste?' is the wordplay.
'producing' indicates anagramming the letters.
'road'+'waste'='roadwaste'
'roadwaste' with letters rearranged gives 'SODA WATER'.

(Other definitions for soda water that I've seen before include "Carbonated drink" , "Fizzy drink" , "Fizzy mixer" , "Possible splash" , "Aerated drink" .)

I've seen this clue in The Telegraph.

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