Crossword Genius

Island road shut after kerbs eroded? (4)

Ross

I believe the answer is:

oahu

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'island' is the definition.
(island in Hawaii)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for oahu that I've seen before include "Hawaiian island" , "Honolulu's island" , "Pacific island" , "Chief island of Hawaii" , "popular Pacific location" .)

I've seen this clue in the Sydney Morning Herald.
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