Propel a shell (3)
I believe the answer is:
oar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">propel a shell</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 oar that I've seen before include "Rower's implement" , "Rowing device" , "I'm involved in row" , "Bladed implement" , "Pole for rowing" .)