Square in Melbourne where exhibition had finally earned money, we hear (4,6)

I believe the answer is:

fair dinkum

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'exhibition had finally earned money we hear' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'square in melbourne' is the wordplay.
'square' becomes 'fair' (I've seen this before).
'in melbourne' becomes 'dinkum' (I am not sure about this - if you are sure you should believe this answer much more).
'fair'+'dinkum'='FAIR DINKUM'

'where' acts as a link.

Can you help me to learn more?

I've seen this clue in The Times.

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