ITNOW

Set to 2 different clues across 2 published puzzles, most often "Do ___!" ("Stop procrastinating!") — The New York Times, Sunday, 31 October 2010.

5 letters

Every clue on record, most used first

"Do ___!" ("Stop procrastinating!")once
The New York Times — Sunday, 31 October 2010
Edward R. Murrow's "See ___"once
The New York Times — Wednesday, 30 May 2007