Rowing blades (4)
I believe the answer is:
oars
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rowing blades</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for oars that I've seen before include "Rowing equipment" , "Soar around the rowers" , "Propellers for small boat" , "These could make you row" , "Henley sportsmen" .)