Crossword Genius

Iron __ (rust) (5)

Ross

I believe the answer is:

oxide

(Other definitions for oxide that I've seen before include "Rust is iron -" , "Compound of oxygen and one other element" , "Rust, for instance" , "Compound of oxygen with another element" , "Chemical compound" .)

I've seen this clue in the Newsday.com, the Newsday and the LA Times.
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