Crossword Genius

Low dam across a river to raise its level upstream (4)

Ross

I believe the answer is:

weir

(Other definitions for weir that I've seen before include "feature of some rivers" , "Feature of river" , "Madagascan primate" , "Structure for raising water level in river" , "Something that may be seen across river" .)

I've seen this clue in The Guardian.
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