Most of Greenland
I believe the answer is:
ice
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">most of greenland</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 "Cubes in a drink" , "It's cold and slippy" , "Skating surface" , "Diamonds (sl)" , "Decorate a cake" .)