Most popular (7)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">most popular</span>' is the definition.<br/ ><span class="explanation-format__explanation">('hot' can be similar in meaning to 'popular')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hottest that I've seen before include "Least cold" , "Most fashionable" , "Most torrid" , "Of the highest temperature" , "Most heated" .)