Machine part (3)
I believe the answer is:
cog
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">machine part</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 cog that I've seen before include "Machine component" , "Small gear-wheel" , "Minor player" , "one engaged in revolutionary activity" , "Tooth on the edge of wheel" .)