Gat (6)
I believe the answer is:
heater
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gat</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for heater that I've seen before include "fire" , "Room warmer" , "Source of warmth; gun" , "Warming device" , "Radiator" .)