At a very high temperature (3,3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">at a very high temperature</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 red hot that I've seen before include "Sexy" , "Very busy" , "At a very high temperature" , "highly emotional" , "Sizzling" .)
(Another definition for redhot that I've seen is " Poker tip may be".)