Filed from 2 published puzzles

FOISTED

Set to 2 different clues across 2 published puzzles, most often “Introduced surreptitiously” — The New York Times, Friday, 28 May 2010.

7 letters

Every clue on record, most used first

Introduced surreptitiouslyonce
The New York Times — Friday, 28 May 2010
Put (on)once
The New York Times — Friday, 19 April 2002

Other answers to these clues

ACT3 letters
ADD3 letters
ADDED5 letters
AIR3 letters
AIRED5 letters
ANACT5 letters
APPLY5 letters
BET3 letters
DON3 letters
FEIGN5 letters
GAIN4 letters
HOAX4 letters