Crossword Genius

Belgian river in a W.W. I battle (4)

Ross

I believe the answer is:

yser

(Other definitions for yser that I've seen before include "Belgian river associated with Flanders battleground" , "Glum" , "River -- battle scene in First World War" , "European river" , "River rising in France" .)

I've seen this clue in The New York Times.
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