Crossword Genius

Branched river mouth (5)

Ross

I believe the answer is:

delta

(Other definitions for delta that I've seen before include "Fourth Greek letter? - area at river mouth" , "Wing shape; Greek D" , "first used by Daedalus" , "Extended area at river mouth" , "Daedalus started with this" .)

I've seen this clue in The Times.
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