Crossword Genius

Black, semi-solid substance that occurs as a residue from petroleum distillation (7)

Ross

I believe the answer is:

asphalt

(Other definitions for asphalt that I've seen before include "Mixture of tar and gravel used in road surfaces" , "Paving material" , "Material for road surfacing etc" , "Bituminous material for roofing, paths etc" , "Bituminous substance used for roofs and roads" .)

I've seen this clue in The Mirror.
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