KLU

Set to 3 different clues across 3 published puzzles, most often '54 N.L. home run leader, familiarly — The New York Times, Saturday, 11 January 2003.

3 letters

Every clue on record, most used first

'54 N.L. home run leader, familiarlyonce
The New York Times — Saturday, 11 January 2003
50's baseball nicknameonce
The New York Times — Sunday, 17 May 1998
50's Reds star, familiarlyonce
The New York Times — Saturday, 5 July 1997