Light bulb inventor (6)
I believe the answer is:
edison
'light bulb inventor' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for edison that I've seen before include "No side to this american inventor" , "US inventor of over 1,000 devices" , "Thomas --, US?inventor" , "Thomas Alva -, US inventor" , "Early American inventor" .)