Dam (4)

I believe the answer is:

weir

'dam' is the definition.
(a weir is a type of dam)

This is all the clue.

(Other definitions for weir that I've seen before include "Small dam to regulate water flow" , "hazard during 14" , "type of block" , "Feature of river" , "Barrier" .)

I've seen this clue in the Evening Standard, The Guardian, the Penny Press and the King Feature Syndicate.

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