Answer: rewarms

AnswerCrossword Clue
REWARMSNukes
REWARMSPuts back in the oven
REWARMSFixes leftovers
REWARMSHeats again, as leftovers
REWARMSPuts on the burner again
REWARMSZaps leftovers, e.g.
rewarmsREWARM, to warm again