No side rise for a US inventor (6)
I believe the answer is:
edison
'a us inventor' is the definition.
(Thomas Edison)
'no side rise' is the wordplay.
'rise' says the letters should be written backwards.
'no'+'side'='noside'
'noside' back-to-front is 'EDISON'.
'for' acts as a link.
(Other definitions for edison that I've seen before include "Incandescent light inventor" , "US inventor of over 1,000 devices" , "Thomas Alva -, US inventor" , "scientist" , "Inventor's" .)