Crossword Genius

Stop blocking, as a river (5)

Ross

I believe the answer is:

undam

'stop blocking as a river' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for undam that I've seen before include "Let loose" , "Free flow from a blockage" .)

I've seen this clue in the Newsday.
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