Filed from 5 published puzzles

IFORGOT

Set to 5 different clues across 5 published puzzles, most often “Excuse for a lapse” — The New York Times, Monday, 11 July 2011.

7 letters

Every clue on record, most used first

Excuse for a lapseonce
The New York Times — Monday, 11 July 2011
"It slipped my mind"once
The New York Times — Sunday, 5 September 2010
Lame excuseonce
The New York Times — Saturday, 20 September 2008
"It slipped my mind!"once
The New York Times — Tuesday, 23 October 2007
"Oops"once
The New York Times — Saturday, 24 May 2003

Other answers to these clues

COPOUT6 letters
IGOOFED7 letters
MYBAD5 letters
OHNO4 letters
OHOH4 letters
SORRY5 letters
UHOH4 letters