Net contains supply for North African city (11)

I believe the answer is:

constantine

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

'north african city' is the definition.
The definition suggests a singular noun which matches the answer.

'net contains supply' is the wordplay.
'supply' indicates an anagram (in a supple way).
'net'+'contains'='netcontains'
'netcontains' anagrammed gives 'CONSTANTINE'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for constantine that I've seen before include "Great man" , "First Christian emperor" .)

I've seen this clue in The Times and The Sunday Times.

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