Television set (9)
I believe the answer is:
gogglebox
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">television set</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 gogglebox that I've seen before include "Television set" , "TV" .)