Crossword Genius

Stunning contribution to flood defence? (7)

Ross

I believe the answer is:

sandbag

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

I don't understand the remainder of the clue.

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(Other definitions for sandbag that I've seen before include "Defence against flooding" , "It's used as a bulwark against flood" , "defensive article" , "Item used in building flood defences" , "Flood barrier builder" .)

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