Smoothly, in music (6)
I believe the answer is:
legato
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">smoothly in music</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for legato that I've seen before include "scored smoothly" , "In music, the opposite of staccato" , "Smoothly, musically speaking" , "Smoothly (musical)" , "In music, in a smooth even manner" .)