Mediator (7)
I believe the answer is:
liaison
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mediator</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for liaison that I've seen before include "Bond of union" , "Channel of communication" , "Intermediary" , "Secretive affair" , "Co-operation; love affair" .)