A striking vessel? (5)
I believe the answer is:
smack
I believe this clue is a double definition.
'a striking' is the first definition.
(I know that smack is a type of blow)
'vessel?' is the second definition.
(smack is a kind of vessel)
(Other definitions for smack that I've seen before include "Suggestion" , "Hit with an open hand" , "Heroin (sl.)" , "Distinctive trace" , "Sharp taste" .)