Do a voice-over (3)
I believe the answer is:
dub
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">do a voice-over</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 dub that I've seen before include "Label, name" , "Knight; call" , "Confer knighthood" , "Make a knight" , "Add sound effects or music" .)