ELDERHOSTEL

Set to 3 different clues across 3 published puzzles, most often “Organizer of senior field trips” — The New York Times, Saturday, 24 April 2004.

11 letters

Every clue on record, most used first

Organizer of senior field tripsonce
The New York Times — Saturday, 24 April 2004
Its motto is "Adventures in lifelong learning"once
The New York Times — Saturday, 16 November 2002
Organization for senior travelersonce
The New York Times — Tuesday, 16 October 2001