Oarsman (5)
I believe the answer is:
rower
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">oarsman</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for rower that I've seen before include "Oarsman (or woman)" , "Person using 9" , "crew member, perhaps" , "He handles oars" , "One in eight, perhaps" .)