Planet between Saturn and Neptune (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
uranus
(Other definitions for uranus that I've seen before include "Planet discovered in 1781 by Herschel" , "Seventh rock from the sun?" , "Planet beyond Saturn" , "Planet that's the butt of much wordplay" , "Planet of solar system" .)