Metal box or jug (3)

I believe the answer is:

can

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This could be a double definition.

'metal box' is the first definition.
'can' can be an answer for 'box' (thesaurus). I am unsure of the 'metal' bit.

'jug' is the second definition.
(both are containers)

'or' acts as a link.

Can you help me to learn more?

(Other definitions for can that I've seen before include "Possesses ability" , "Preserve fruit" , "Vessel" , "John" , "Cooler" .)

I've seen this clue in the Evening Standard.

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