ERRON

Set to 2 different clues across 2 published puzzles, most often “___ the side of caution” — The New York Times, Tuesday, 21 October 2003.

5 letters

Every clue on record, most used first

___ the side of cautiononce
The New York Times — Tuesday, 21 October 2003
___ the side of caution (play it safe)once
The New York Times — Wednesday, 12 August 1998