Related Clues:

• Race divisions
• Meet preliminaries
• Inflames
• Uses a microwave
• Puts on the back burner?
• Track rounds
• Puts in the microwave
• Makes warmer
• Track meet events
• Warms up, as leftovers
• Intensifies, with ''up''
• Warms
• Eliminating rounds in a contest
• Makes hot or warm
• They're not the final plural of 12 across