Informal agreement (13)
I believe the answer is:
understanding
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">informal agreement</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 understanding that I've seen before include "Compassion" , "Gathering" , "compassionate" , "Empathy" , "Getting" .)