Heavily weighed down (5)
I believe the answer is:
laden
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">heavily weighed down</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 laden that I've seen before include "Like many a cargo ship" , "cargo aboard" , "Of ship, having taken on cargo" , "charged a lot" , "packed with cargo" .)