Man from East London circumventing old Ohio ravine (6)

I believe the answer is:

arroyo

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'ravine' is the definition.
(type of ravine or gully)

I can't explain the remainder of the clue.

(Other definitions for arroyo that I've seen before include "Rocky ravine" , "Dry river gully" , "dry course" , "Dry gully; yo roar (anag.)" , "Often dry desert ravine" .)

I've seen this clue in The Times and The Sunday Times.

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