Host, master of ceremonies (7)
I believe the answer is:
compere
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">host</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(host of an event)</span><br/ ><br/ >'<span class="explanation-format__original">master of ceremonies</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(compere is a kind of master of ceremonies)</span><br/ ><br/ ></span>
(Other definitions for compere that I've seen before include "TV presenter?" , "host show" , "(Male) show introducer" , "M.C." , "Master of ceremonies" .)