Relating to heat (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">relating to heat</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 thermal that I've seen before include "Warming" , "which can take a glider up" , "Her malt became heat-related" , "Warm or hot - underwear?" , "Up-current of air" .)
(Another definition for caloric that I've seen is " Thermal".)