Euphonious (7)
I believe the answer is:
melodic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">euphonious</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for melodic that I've seen before include "Pleasant-sound" , "Harmonious" , "Pleasant-sounding" , "Of music, tuneful and sweet" , "Old mice (anag.)" .)