OXIDIZE

Set to 3 different clues across 3 published puzzles, most often “Get rusty” — The New York Times, Friday, 3 September 2010.

7 letters

Every clue on record, most used first

Get rustyonce
The New York Times — Friday, 3 September 2010
Go from aluminum to alumina, sayonce
The New York Times — Saturday, 3 April 2010
Form rust, sayonce
The New York Times — Monday, 2 March 2009