Inventor is done getting confused (6)
I believe the answer is:
edison
'inventor' is the definition.
(I know that Edison is a inventor)
'is done getting confused' is the wordplay.
'getting confused' is an anagram indicator.
'is'+'done'='isdone'
'isdone' with letters rearranged gives 'EDISON'.
(Other definitions for edison that I've seen before include "US inventor of phonograph, electric light etc." , "Incandescent light inventor" , "Thomas --, US?inventor" , "Inventor's" , "Inventor of the light bulb" .)