Wheels connector (4)
I believe the answer is:
axle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wheels connector</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for axle that I've seen before include "Shaft with wheels attached" , "Wheel pivot" , "Shaft used for rotation" , "Wheel rotates around it" , "A wheel revolves around it" .)