Harmony, accord (5)
I believe the answer is:
unity
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">harmony</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">accord</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for unity that I've seen before include "Mitford girl" , "State of togetherness" , "One - mutual agreement" , "Accord" , "State of complete and harmonious whole" .)