Vehicle frame (7)
I believe the answer is:
chassis
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vehicle frame</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for chassis that I've seen before include "Framework of motor vehicle" , "Vehicle's structural frame" , "Bodywork" , "Body frame" , "Car's body" .)