Crossword Genius

No energy for sort of inter-ocean vessel (9)

Ross

I believe the answer is:

container

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in the Sydney Morning Herald.
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