Smoothly change the subject (5)
I believe the answer is:
segue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">smoothly change the subject</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for segue that I've seen before include "carry on" , "Smooth musical transition" , "Follow on seamlessly" , "Proceed immediately" , "Keep going without interruption" .)