DEFROST

Set to 2 different clues across 2 published puzzles, most often “Microwave setting” — The New York Times, Wednesday, 14 July 2004.

7 letters

Every clue on record, most used first

Microwave settingonce
The New York Times — Wednesday, 14 July 2004
Modern refrigerators do it automaticallyonce
The New York Times — Monday, 1 September 1997