Vessel for boiling water (6)
I believe the answer is:
kettle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vessel for boiling 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 kettle that I've seen before include "Water boiler" , "Vessel for heating liquids" , "Check elements causing trouble in demonstration" , "Kitchen utensil and type of drum" , "Container for heating 10" .)