Filed from 4 published puzzles

HEADSUP

Set to 3 different clues across 4 published puzzles, most often “Alert” — The New York Times, Saturday, 28 July 2001.

7 letters

Every clue on record, most used first

Alert2 times
The New York Times — Saturday, 28 July 2001
"Careful!"once
The New York Times — Wednesday, 10 December 2003
"Look out!"once
The New York Times — Friday, 31 January 2003

Other answers to these clues

AWARE5 letters
BELOW5 letters
CANNY5 letters
DOBE4 letters
OHOH4 letters
ONONESTOES10 letters
ONTHEBALL9 letters
OPENEYED8 letters
QUIVIVE7 letters
READY5 letters
RED3 letters
TIPOFF6 letters