Zone round edge of Mestre available as refuge from Venice (7)

I believe the answer is:

belmont

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'refuge from venice' is the definition.
(location in Shakespeare's The Merchant of Venice)

'zone round edge of' is the wordplay.
'zone' becomes 'belt' (belt is a kind of zone).
'round' means one lot of letters goes inside another.
'edge of' becomes 'mon' (I can't justify this - if you can you should give a lot more credence to this answer).
'belt' going around 'mon' is 'BELMONT'.

'mestre available as' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

I've seen this clue in The Times.

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