Crossword Genius

Oxidation (4)

Ross

I believe the answer is:

rust

'oxidation' is the definition.
(I know that rust is a type of oxidation)

This is the entire clue.

(Other definitions for rust that I've seen before include "Reddish oxide coating on iron" , "Reddish-brown colour" , "Reddish-brown coating caused by oxidation" , "Reddish coating formed on iron through 11 across" , "A fungus; a corrosion" .)

I've seen this clue in The Mirror.
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