MIB

Set to 2 different clues across 3 published puzzles, most often “Kid's marble” — The New York Times, Saturday, 8 April 1995.

3 letters

Every clue on record, most used first

Kid's marble2 times
The New York Times — Saturday, 8 April 1995
1997 Will Smith/Tommy Lee Jones blockbuster, for shortonce
The New York Times — Sunday, 24 January 2010