Microphone inventor (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">microphone inventor</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for edison that I've seen before include "Inventor with over 1,000 US patents to his name, d. 1931" , "Inventor of the carbon filament lamp, d. 1931" , "US scientist/inventor" , "inventive sort" , "scientist" .)