Workers' organization (5)
I believe the answer is:
union
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">workers' organization</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 union that I've seen before include "Organisation of employees for bargaining purposes" , "Workers' association - marriage" , "Equity is one" , "Workers' federation" , "The joining of two or more together" .)