Australian organised wild party (10)

I believe the answer is:

saturnalia

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

'australian organised' is the wordplay.
'organised' indicates anagramming the letters.
'australian' with letters rearranged gives 'SATURNALIA'.

(Other definitions for saturnalia that I've seen before include "orgy" , "wild party" , "Old festival" , "Ancient Roman December festival" , "revels" .)

I've seen this clue in The Telegraph.

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