Crossword Genius

Sound recording pioneer (6)

Ross

I believe the answer is:

edison

(Other definitions for edison that I've seen before include "Thomas Alva -, US inventor" , "inventive sort" , "Thomas --, US?inventor" , "He came up with microphone" , "Thomas Alva ......, great American inventor" .)

I've seen this clue in the Newsday.
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