XDIN

Set to 3 different clues across 3 published puzzles, most often “Marked, as a questionnaire box” — The New York Times, Thursday, 17 February 2011.

4 letters

Every clue on record, most used first

Marked, as a questionnaire boxonce
The New York Times — Thursday, 17 February 2011
Marked, as a box on a testonce
The New York Times — Tuesday, 5 July 2005
Marked, as a paper ballotonce
The New York Times — Sunday, 29 June 2003