Concordant (10)
I believe the answer is:
harmonious
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">concordant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for harmonious that I've seen before include "Tuneful" , "In tune; friendly" , "In agreement" .)