Spindle (4)
I believe the answer is:
axle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spindle</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for axle that I've seen before include "wheel section" , "Spindle between wheels" , "Metal pin on which wheel revolves" , "Rod of wheelbase" , "Shaft on which wheels rotate" .)