On the same side (6)
I believe the answer is:
allied
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">on the same side</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for allied that I've seen before include "Joined by treaty or agreement" , "Joined in friendship, treaty, etc" , "Joined together for mutual support" , "Joined to, combined with" , "Joined together for a purpose" .)