Crossword Genius

So 'noire' (anag) (7)

Ross

I believe the answer is:

erosion

(Other definitions for erosion that I've seen before include "Abrasion" , "Deterioration of soil etc" , "Gradual decline" , "A wearing away as of rock by water" , "Process of wearing away, by water or time" .)

I've seen this clue in The Guardian.
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