A bed warmer (8,7)
I believe the answer is:
electric blanket
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a bed warmer</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 electric blanket that I've seen before include "Provider of extra bed heat" , "this might warm you up" , "Bed warmer" , "cover at night" , "Bed heater" .)