Violently attacks container vessels (4)
I believe the answer is:
mugs
This clue might be a double definition.
'violently attacks' is the first definition.
'mugs' can be an answer for 'attacks' (I've seen this before). I'm unsure of the 'violently' bit.
'container vessels' is the second definition.
'mugs' can be an answer for 'vessels' (mug is a kind of vessel). I'm unsure of the 'container' bit.
Can you help me to learn more?
(Other definitions for mugs that I've seen before include "Cylindrical cups without saucer" , "Gullible people" , "'Cups, faces and fall guys (4)'" , "fools and > grimaces" , "Cups; dupes" .)