Crossword Genius

Old explosive device used to breach castle walls (6)

Ross

I believe the answer is:

petard

(Other definitions for petard that I've seen before include "Explosive device (with which one may be hoist)" , "Explosive device carried to blow in a door" , "Something likely to explode" , "Bomb - depart (anag)" , "Case of explosive" .)

I've seen this clue in The New York Times.
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