Heavy object (6)
I believe the answer is:
weight
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">heavy object</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 weight that I've seen before include "Importance, oppressive force" , "The property of heaviness, measure of mass" , "gives a sense of oppression" , "Gravitational pull" , "Avoir-du-pois" .)