Filed from 2 published puzzles

YERTLETHETURTLE

Set to 2 different clues across 2 published puzzles, most often “Story written by 38-Across” — The New York Times, Tuesday, 2 March 2004.

15 letters

Every clue on record, most used first

Story written by 38-Acrossonce
The New York Times — Tuesday, 2 March 2004
Dr. Seuss titleonce
The New York Times — Tuesday, 10 May 1994

Other answers to these clues

FOXINSOCKS10 letters
HOPONPOP8 letters
HORTONHEARSAWHO15 letters
IFIRANTHECIRCUS15 letters