Crossword Genius

Tar (7)

Ross

I believe the answer is:

bitumen

'tar' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for bitumen that I've seen before include "coverage on the streets?" , "Road's topping" , "Material for road surfacing, roofing, etc" , "Tarry substance used to surface roads and roofs" , "Mixed-up tar" .)

I've seen this clue in the Evening Standard.
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