Opal in Melbourne, some dreamy kind? (4)

I believe the answer is:

myki

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'opal in melbourne' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'some dreamy kind?' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'MYKI' can be found hidden inside 'dreamy kind'.

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I've seen this clue in the Sydney Morning Herald.

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