Double act (3)
I believe the answer is:
duo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">double act</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for duo that I've seen before include "Item" , "Two players" , "Pair of musicians" , "Pair of people/things" , "Pair of singers" .)