Filed from 7 published puzzles

LMNO

Set to 6 different clues across 7 published puzzles, most often “Alphabet quartet” — The New York Times, Sunday, 23 March 1997.

4 letters

Every clue on record, most used first

Alphabet quartet2 times
The New York Times — Sunday, 23 March 1997
Alphabet runonce
The New York Times — Friday, 13 May 2011
Middle of a run?once
The New York Times — Sunday, 1 July 2001
Alphabetic runonce
The New York Times — Tuesday, 8 October 1996
K-P intervalonce
The New York Times — Wednesday, 4 October 1995
Rows before Ponce
The New York Times — Tuesday, 18 January 1994

Other answers to these clues

CDEF4 letters
EFG3 letters
LMN3 letters
MNOP4 letters
PQRS4 letters
QRS3 letters
QRST4 letters
RST3 letters
RSTU4 letters
STU3 letters
STUV4 letters