Filed from 5 published puzzles

TWENTYONE

Set to 4 different clues across 5 published puzzles, most often “Gambling game” — The New York Times, Thursday, 11 March 1999.

9 letters

Every clue on record, most used first

Gambling game2 times
The New York Times — Thursday, 11 March 1999
Number associated with 17-, 25-, 41- and 51-Acrossonce
The New York Times — Tuesday, 31 May 2011
*Blackonce
The New York Times — Wednesday, 9 February 2011
Theme of this puzzleonce
The New York Times — Wednesday, 8 October 2003

Other answers to these clues

AIRPORT7 letters
ANGUS5 letters
ATOZTOA7 letters
BACKINTOACORNER15 letters
BEANO5 letters
BEES4 letters
BLACKJACK9 letters
BLENDERSETTINGS15 letters
BLONDS6 letters
BOARD5 letters
BOATPEOPLE10 letters
BOWLS5 letters