Crossword Genius

Result of oxidation (4)

Ross

I believe the answer is:

rust

'result of oxidation' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for rust that I've seen before include "Reddish-brown colour" , "Reddish-brown oxide coating" , "Oxidised iron" , "Corrode" , "Reddish oxide coating on iron" .)

I've seen this clue in The Chronicle of Higher Education and the USA Today.
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