ISNO

Set to 12 different clues across 17 published puzzles, most often "Ignorance ___ excuse" — The New York Times, Thursday, 23 September 2004.

4 letters

Every clue on record, most used first

"Ignorance ___ excuse"3 times
The New York Times — Thursday, 23 September 2004
"This ___ joke!"2 times
The New York Times — Friday, 14 January 2011
"Money ___ object"2 times
The New York Times — Monday, 8 December 2003
"Money ___ object!"2 times
The New York Times — Wednesday, 27 September 2000
"There ___ 'I' in 'team'"once
The New York Times — Wednesday, 9 February 2011
"The answer ___"once
The New York Times — Friday, 2 July 2010
"That ___ excuse"once
The New York Times — Tuesday, 14 February 2006
"But there ___ joy in Mudville ?"once
The New York Times — Monday, 7 November 2005
"The answer ___!"once
The New York Times — Sunday, 9 January 2005
"That ___ excuse!"once
The New York Times — Wednesday, 9 January 2002
"There ___ excuse!"once
The New York Times — Sunday, 30 July 2000
"This ___ laughing matter!"once
The New York Times — Wednesday, 17 June 1998