An intermediary (2-7)
I believe the answer is:
go-between
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">an intermediary</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that intermediary can be written as go-between)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for go-between that I've seen before include "Intermediary" , "One who acts as messenger or negotiator" , "Runner" .)