Cap material? (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cap material?</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 "Slippery surface" , "Some number" , "A state of water" , "Chill - harden" , "Solid water" .)