Crossword Genius

Oxidation (4)

Ross

I believe the answer is:

rust

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">oxidation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(rust is a kind of oxidation)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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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