Merged (6)
I believe the answer is:
united
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">merged</span>' is the definition.<br/ ><span class="explanation-format__explanation">('unite' can be a synonym of 'merge')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for united that I've seen before include "collective" , "Unified" , "Married pair, are, like Man U!" , "See 18" , "Agreed" .)