Main artery (5)

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">main artery</span>' is the definition.<br/ ><span class="explanation-format__explanation">(largest artery)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for aorta that I've seen before include "This carries blood from the heart" , "Bloody channel" , "Main artery of body" , "A rota (anag)" , "Great artery in body" .)
(Other definitions for trunk road that I've seen before include "Arterial thoroughfare" , "major way" .)