Swampy tributary of south USA; a buoy (anagram) (5)

I believe the answer is:

bayou

(Other definitions for bayou that I've seen before include "Swamp in Louisiana etc" , "Marshy area in southern US" , "US marshland" , "Marshy tributary of lake or river - a buoy (anag)" , "nickname of US State" .)

I've seen this clue in The Times.

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