Signal to enter Western Australian mineral deposit (4,2)

I believe the answer is:

wave in

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'signal to enter' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'western australian mineral deposit' is the wordplay.
'western' becomes 'w'.
'australian' becomes 'A' (common abbreviation).
'mineral deposit' becomes 'vein' (I've seen this in another clue).
'w'+'a'+'vein'='WAVE IN'

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

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