Majestic Australian storm (6)

I believe the answer is:

august

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'majestic' is the definition.
(I've seen this before)

'australian storm' is the wordplay.
'australian' becomes 'au'.
'storm' becomes 'gust' (I can't explain this - if you can you should give a lot more credence to this answer).
'au'+'gust'='AUGUST'

Can you help me to learn more?

(Other definitions for august that I've seen before include "when students are down?" , "part of the summer" , "Revered" , "Grand, lordly" , "Distinguished" .)

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

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