Crossword Genius

Used car concern (4)

Ross

I believe the answer is:

rust

(Other definitions for rust that I've seen before include "Oxidisation" , "Reddish-brown oxide coating" , "Reddish-brown coating formed on iron by moisture" , "Reddish coating formed on iron through 11 across" , "Fungal plant disease" .)

I've seen this clue in the LA Times.
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