Projectiles cause blazes in the ship (6)
I believe the answer is:
shells
'projectiles' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps there's a link between them I don't understand?
'cause blazes in the ship' is the wordplay.
'cause blazes' becomes 'hell' (I can't explain this - if you can you should give a lot more credence to this answer).
'in the' indicates putting letters inside.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'hell' going inside 'ss' is 'SHELLS'.
Can you help me to learn more?
(Other definitions for shells that I've seen before include "Collect them on the seashore" , "Carapaces or projectiles for cannons" , "Carapaces or large missiles" , "'''She sells sea ... by the sea shore'' (6)'" , "Hard protective structures" .)