Agreement, concord (7)
I believe the answer is:
harmony
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">agreement</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that harmony is a type of agreement)</span><br/ ><br/ >'<span class="explanation-format__original">concord</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that concord can be written as harmony)</span><br/ ><br/ ></span>
(Other definitions for harmony that I've seen before include "Mellifluous sound" , "Mutual rapport" , "Sweet or melodious sound, no disagreement" , "Accord" , "Agreement, concord" .)