KNURL

Set to 3 different clues across 3 published puzzles, most often “Button ridge” — The New York Times, Sunday, 22 May 2011.

5 letters

Every clue on record, most used first

Button ridgeonce
The New York Times — Sunday, 22 May 2011
Small ridge on the edge of a button or dialonce
The New York Times — Thursday, 22 October 2009
Small knobonce
The New York Times — Monday, 6 June 2005