Crossword Genius

Bituminous substance (7)

Ross

I think it could be either:

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3

7

asphalt

(Other definitions for asphalt that I've seen before include "Paving material" , "Bituminous substance used in building" , "Road-building material" , "Mixture of tar and gravel used in road surfaces" , "Dark natural pitch" .)

I've seen this clue in The Sun.
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