Ship's propeller (5)
I believe the answer is:
screw
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ship's propeller</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 screw that I've seen before include "Fastener with a tapered threaded shank" , "Fastener, rivet" , "The Turn of the ___ , 1898 Henry James horror story" , "Metal fastener" , "one on prison door?" .)