Bombard Hull (5)
I believe the answer is:
shell
This clue is a double definition.
'bombard' is the first definition.
(shelling is a kind of bombarding)
'hull' is the second definition.
(shell is a kind of hull)
(Other definitions for shell that I've seen before include "Carapace or explosive missile" , "Mollusc's protection" , "Hard outer case" , "ammunition" , "Carapace or cartridge" .)