Crossword Genius

With zero change, it is a short gun for firing shells (8)

Ross

I believe the answer is:

howitzer

(Other definitions for howitzer that I've seen before include "Gun firing shells at a steep angle" , "Military weapon" , "Type of gun" , "Cannon with a steep firing angle" , "Shell-firing gun" .)

I've seen this clue in The Irish Times.
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