Crossword Genius

A water blockage (3)

Ross

I believe the answer is:

dam

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This clue could be a double definition.

'a water' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'blockage' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for dam that I've seen before include "Water barrier, quite mad" , "Reservoir barrier" , "eg Aswan" , "Wall restraining water" , "Mother - barrier" .)

I've seen this clue in the Evening Standard.
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