Crossword Genius

Block (up) (3)

Ross

I believe the answer is:

dam

'block up' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for dam that I've seen before include "Weir" , "Water retainer" , "Mad as an animal mum" , "A mad sort of mum" , "River restraint" .)

I've seen this clue in The New York Times and the King Feature Syndicate.
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