Main component of Saturn's rings
I believe the answer is:
ice
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">main component of saturn's rings</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ice that I've seen before include "Top cake" , "Constituent of 2dn" , "Cold stuff used in enticement" , "Frozen liquid" , "Decorate with frosting" .)