Form of water (3)
I believe the answer is:
ice
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">form of water</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 ice that I've seen before include "Skating surface" , "Cooler" , "Rocks on which drink is served?" , "Formality" , "Diamonds (colloq.)" .)