Mineral pitch (7)
I believe the answer is:
asphalt
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mineral pitch</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for asphalt that I've seen before include "petroleum residue" , "Material for covering roads" , "Mixture of tar and gravel used in road surfaces" , "Bituminous material for roofing, paths etc" , "Road-buiding material" .)