PENNA

Set to 2 different clues across 3 published puzzles, most often “Quaker State: Abbr.” — The New York Times, Wednesday, 27 April 2011.

5 letters

Every clue on record, most used first

Quaker State: Abbr.2 times
The New York Times — Wednesday, 27 April 2011
Feather, to an ornithologistonce
The New York Times — Saturday, 25 December 1999