Instalment of a TV series (7)
I believe the answer is:
episode
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">instalment of a tv series</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 episode that I've seen before include "One programme of a series" , "Incident or one part of a story" , "Story instalment" , "A chapter or incident" , "Set of incidents" .)