Orbital route (4,4)
I believe the answer is:
ring road
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">orbital route</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ring road that I've seen before include "roundabout?" , "Bypass encircling a town" , "M25, for example" , "Bypass round urban area" , "Bypassing thoroughfare" .)