Asphalt component (3)
I believe the answer is:
tar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">asphalt component</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tar that I've seen before include "Sailor - laid on road" , "Black substance, used on roads" , "Tobacco residue; sailor" , "It paves the way" , "Sticky substance - seaman" .)