Second-largest planet (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">second-largest planet</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for saturn that I've seen before include "Titan its moon" , "Sixth planet from the sun" , "tried to pass vessel" , "Massive body ringed" , "Nearest ringed planet" .)