Mixture of bitumen and gravel used for road surfacing (7)

I believe the answer is:

asphalt

(Other definitions for asphalt that I've seen before include "Substance used in roofing and paving" , "Road-buiding material" , "Bituminous road dressing" , "Road surface material" , "Bituminous material for roofing, paths etc" .)

I've seen this clue in The Times.

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