No energy for sort of inter-ocean vessel (9)
I believe the answer is:
container
'vessel' is the definition.
(I know that container is a vessel)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for container that I've seen before include "Bag, perhaps" , "Receptacle" , "Vessel" , "Metal shipping box" , "Something to hold" .)