Filed from 4 published puzzles

THWART

Set to 3 different clues across 4 published puzzles, most often “Foil” — The New York Times, Sunday, 14 October 2001.

6 letters

Every clue on record, most used first

Foil2 times
The New York Times — Sunday, 14 October 2001
Stymieonce
The New York Times — Monday, 10 October 1994
Blockonce
The New York Times — Monday, 14 March 1994

Other answers to these clues

BAN3 letters
BAR3 letters
BARRIER7 letters
BUFFALO7 letters
CLOG4 letters
DAM3 letters
DAMUP5 letters
DEBAR5 letters
DETER5 letters
EMBAR5 letters
ESTOP5 letters
FRUSTRATE9 letters