Hotness (4)
'hotness' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for heat that I've seen before include "Raise temperature" , "Preliminary race to qualify finalists" , "Pressure" , "Hotness" , "Energy that caues a rise in temperature" .)
(Other definitions for temperature that I've seen before include "Degree of heat" , "Degree of hotness" , "Measure of warmth" , "Measure of heat" .)