One's surrounded by containers in part of Rome (7)
I believe the answer is:
vatican
'part of rome' is the definition.
('Vatican' is part of 'rome')
'one's surrounded by containers' is the wordplay.
I cannot quite understand how this works, but
'by' could be 'at' and 'at' is found in the answer.
'one' could be 'an' (an apple is one apple) and 'an' is present in the answer.
The remaining letters 'vic' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'in' is the link.
Can you help me to learn more?
(Other definitions for vatican that I've seen before include "City within Rome" , "Papacy" , "religious authority" , "Papal hill and city" , "Papal residence" .)