Move heavily on wheels (7)
I believe the answer is:
trundle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">move heavily on wheels</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 trundle that I've seen before include "Move along heavily" , "Wheel along clumsily" , "44 [TROLLEY] may do" , "slow movement" , "go around" .)