Oarsmen (6)
I believe the answer is:
rowers
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">oarsmen</span>' is the definition.<br/ ><span class="explanation-format__explanation">('rower' can be a synonym of 'oarsman')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for rowers that I've seen before include "Oarsmen" , "The O'Donovan brothers, say" .)