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Corrosion (4)

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There are a few possibilities for this:

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

This is the entire clue.

(Other definitions for rust that I've seen before include "A fungus; a corrosion" , "Reddish oxide coating on iron" , "Reddish-brown colour" , "Corrode" , "Oxidisation" .)

I've seen this clue in The Mirror, the Evening Standard, The Independent, the Penny Press and The Star Tribune.
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