Inventor turned edge on (6)
I believe the answer is:
edison
'inventor' is the definition.
(Edison is an example)
'turned edge on' is the wordplay.
'turned' says the letters should be written backwards.
'edge' becomes 'side' (edge can mean the side of something).
'side' in reverse letter order is 'edis'.
'edis'+'on'='EDISON'
(Other definitions for edison that I've seen before include "US inventor of phonograph, electric light etc." , "US inventor of over 1,000 devices" , "Thomas Alva ......, great American inventor" , "Thomas Alva -, US inventor" , "Inventor of the light bulb" .)