Answer: heatedup

AnswerCrossword Clue
HEATEDUPNuked
HEATEDUPIntensified, as an argument
HEATEDUPBecame more intense, as a competition
HEATEDUPWarmed over.
HEATEDUPBecame excited: Colloq.
HEATEDUPBecame more competitive
HEATEDUPBecame more exciting