Filed from 4 published puzzles

SURELY

Set to 4 different clues across 4 published puzzles, most often “Without slipping” — The New York Times, Saturday, 16 July 2005.

6 letters

Every clue on record, most used first

Without slippingonce
The New York Times — Saturday, 16 July 2005
Doubtlessonce
The New York Times — Friday, 14 March 2003
"Of course!"once
The New York Times — Tuesday, 21 May 1996
Without questiononce
The New York Times — Sunday, 5 May 1996

Other answers to these clues

AHA3 letters
BYALLMEANS10 letters
BYFAR5 letters
CERTAINLY9 letters
DEFINITELY10 letters
DUH3 letters
ISEE4 letters
NATCH5 letters
SURETHING9 letters
TOBESURE8 letters
WELLYES7 letters
WITHOUTQUESTION15 letters