Stoppered vessel, vessel secured by stop! (8)
I believe the answer is:
decanter
'stoppered vessel' is the definition.
(container for drink)
'vessel secured by stop' is the wordplay.
'vessel' becomes 'can' (I've seen this before).
'secured by' is an insertion indicator (I've seen this in other clues).
'stop' becomes 'deter' (I've seen this before).
'can' put inside 'deter' is 'DECANTER'.
(Other definitions for decanter that I've seen before include "Serving bottle for liquor" , "Glass container for table wine" , "bottle needed" , "Type of carafe" , "Glass spirits container" .)