Camden store runs out of English shoes (3,7)

'camden' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'store runs out of english shoes' is the wordplay.
I cannot really see how this works, but
'store' could be 'mart' (I've seen this in another clue) and 'mart' is found within the answer.
'of' could be 'o' and 'o' is present in the answer.
'english' could be 'e' (abbreviation) and 'e' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?