ICHAT

Set to 5 different clues across 6 published puzzles, most often “Apple messaging software” — The New York Times, Tuesday, 12 July 2011.

5 letters

Every clue on record, most used first

Apple messaging software2 times
The New York Times — Tuesday, 12 July 2011
Instant-messaging program for Macsonce
The New York Times — Monday, 8 August 2011
Apple's instant-messaging programonce
The New York Times — Sunday, 3 October 2010
Apple instant-messaging programonce
The New York Times — Wednesday, 23 July 2008
Popular Apple communication softwareonce
The New York Times — Monday, 14 August 2006