Crossword Genius

Iron corrosion (4)

Ross

I believe the answer is:

rust

'iron corrosion' 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 coating formed on metal by damp" , "Corrode" , "Reddish-brown coating formed on iron by moisture" , "Red or brown oxide coating on iron or steel" , "Fungal disease of plants" .)

I've seen this clue in the Newsday.
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