Crossword Genius

Sign of inactivity


I believe the answer is:


'sign of inactivity' 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 "Oxidised iron" , "Red or brown oxide coating on iron or steel" , "Reddish-brown coating caused by oxidation" , "Reddish coating formed on iron through 11 across" , "Oxidisation" .)

I've seen this clue in The New York Times.
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