Harass a speaker (6)
I believe the answer is:
heckle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">harass a speaker</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 heckle that I've seen before include "Barrack speaker" , "Verbally interrupt performer" , "Loudly interrupt a public meeting" , "disrupt meeting" , "Harass a speaker" .)