Wearing away (7)

I think it could be either:

erosion

eroding

'wearing away' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for erosion that I've seen before include "The wearing away by water or weather" , "Gradual decline" , "dying away" , "being eaten away" , "The gradual wearing away by weather" .)

I've seen this clue in The Independent, the Penny Press, The Mirror, The Star Tribune, the Sydney Morning Herald and The Telegraph.

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