Worn in all weathers (6)

I believe the answer is:

eroded

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'worn' is the definition.
(similar in meaning)

I cannot understand how the remainder of the clue works.

(Other definitions for eroded that I've seen before include "Worn away, ground down" , "Worn away by time, wind or water" , "Eaten away" , "Wore away" , "Worn away by weather or water" .)

I've seen this clue in the Evening Standard.

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