Crossword Genius

Become rusty (7)

Ross

I think it could be either:

oxidise

oxidate

(Other definitions for oxidise that I've seen before include "Combine chemically with a particular gas - ie six do (anag)" , "Eg, go rusty" , "Eg, rust (S, not Z)" .)

I've seen this clue in the Sydney Morning Herald and The Sun.
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