HINNY

Set to 3 different clues across 3 published puzzles, most often “Rare equine hybrid” — The New York Times, Friday, 30 July 2010.

5 letters

Every clue on record, most used first

Rare equine hybridonce
The New York Times — Friday, 30 July 2010
Horse/donkey crossonce
The New York Times — Sunday, 18 June 2006
Cross of a male horse and a female donkeyonce
The New York Times — Wednesday, 24 November 1999