For all to see, what FDR did for the world (6)
I believe the answer is:
uranus
'world' is the definition.
('world' could refer to any planet)
I cannot understand how the rest of the clue works.
(Other definitions for uranus that I've seen before include "Planet discovered by William Herschell in 1781" , "Might USA run up the planet?" , "Planet discovered in 1781 by Herschel" , "Seventh planet from the sun" , "Holst's Magician planet" .)