Crossword Genius

Noise or otherwise, it's a feature of coastlines (7)

Ross

I believe the answer is:

erosion

'a feature of coastlines' is the definition.
(coastlines erode)

'noise or otherwise' is the wordplay.
'otherwise' is an anagram indicator.
'noise'+'or'='noiseor'
'noiseor' is an anagram of 'EROSION'.

'it's' acts as a link.

(Other definitions for erosion that I've seen before include "The wearing away by water or weather" , "Disintegration" , "Process of wearing away, by water or time" , "The wearing away by weather 97)" , "Gradual decline" .)

I've seen this clue in The Telegraph.
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