Natural bituminous material used for making pavements, etc (7)

I believe the answer is:

asphalt

(Other definitions for asphalt that I've seen before include "Bituminous substance used for roofs and roads" , "Bituminous road dressing" , "surface of path" , "Dark substance used in road surfaces" , "Bituminous substance used in building" .)

I've seen this clue in The Guardian.

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