Unit of heat (6)
'unit of heat' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for therm that I've seen before include "Indicator of heat" , "Unit of heat and gas measure" , "Unit of heat energy" , "Unit of measurement of heat" , "Amount of heat" .)
'unit of heat' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for calorie that I've seen before include "Unit of energy in foods" , "Unit of heat energy" , "Unit of heat (concerned with diet)" , "A recoil (anag.)" , "Food energy unit" .)
(Other definitions for degree that I've seen before include "Angular measure" , "Level of intensity, in scale" , "Angular unit and college award" , "Unit of measurement of angle" , "Award given to a college graduate" .)