Planet beyond Saturn (6)
I believe the answer is:
uranus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">planet beyond saturn</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for uranus that I've seen before include "Greek god ruler of universe, or a major planet" , "Might USA run up the planet?" , "Planet discovered by William Herschell in 1781" , "space traveller" , "Seventh planet from the sun" .)