Crossword Genius

Flood defence (4)

Ross

I believe the answer is:

dyke

'flood defence' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for dyke that I've seen before include "Boundary earthwork" , "Flood embankment" , "Defensive earthwork" , "Flood defence" , "Anti-flood ditch/wall" .)

I've seen this clue in The Independent and The Times.
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