Filed from 3 published puzzles

SHEPARD

Set to 3 different clues across 3 published puzzles, most often “First American in space” — The New York Times, Tuesday, 20 April 2010.

7 letters

Every clue on record, most used first

First American in spaceonce
The New York Times — Tuesday, 20 April 2010
Astronaut Alanonce
The New York Times — Monday, 29 September 2008
One of 39-Acrossonce
The New York Times — Tuesday, 27 October 1998

Other answers to these clues

CARPENTER9 letters
COOPER6 letters
GLENN5 letters
GRISSOM7 letters
SCHIRRA7 letters
SLAYTON7 letters