Where you may find an Araucaria declaration bang out of order (9,6)

I believe the answer is:

botanical garden

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'where you may find an araucaria' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'declaration bang out of order' is the wordplay.
'out of order' indicates anagramming the letters.
'declaration'+'bang'='declarationbang'
'declarationbang' is an anagram of 'BOTANICAL GARDEN'.

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