BOULDER

Set to 2 different clues across 2 published puzzles, most often “Rock that may be hard to roll” — The New York Times, Tuesday, 26 April 2011.

7 letters

Every clue on record, most used first

Rock that may be hard to rollonce
The New York Times — Tuesday, 26 April 2011
Obstruction at the entrance to a cave, maybeonce
The New York Times — Thursday, 23 August 2007