Not hot (4)
I believe the answer is:
cold
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not hot</span>' is the definition.<br/ ><span class="explanation-format__explanation">('cold' is the opposite to 'hot')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for cold that I've seen before include "Common ailment" , "complaint" , "Lacking warmth" , "Chilly; minor ailment" , "Chilly; unemotional" .)