Crossword Genius

Protective wall in front of a trench (7)

Ross

I believe the answer is:

parapet

(Other definitions for parapet that I've seen before include "Low wall (on bridge, roof, etc)" , "Defensive line" , "Protective cover" , "Militarily, it protects" , "Breastwork" .)

I've seen this clue in the Sydney Morning Herald.
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