Possible Clues:

• Heat meas
• Longtime TV broadcaster of 87-Across games
• Heat energy meas
• Food energy unit hidden in 'prank call'
• Heat meas. that also names a major L.A. TV station
• Certain unit of heat, for short
• Food energy unit: Abbr.
• Heat energy meas.
• Heat meas.
• Heat amt. equal to 4,184 joules