FISSION
Set to 2 different clues across 2 published puzzles, most often “Energy producer” — The New York Times, Saturday, 7 February 2004.
7 letters
Every clue on record, most used first
- Energy produceronce
The New York Times — Saturday, 7 February 2004
- Atomic energy sourceonce
The New York Times — Saturday, 13 March 1999