Victoria's arboreous area (4)

I believe the answer is:

wood

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'area' is the definition.
(I have seen 'Area of trees ' mean 'wood' so perhaps 'area' could also mean 'wood')

I cannot understand how the rest of the clue works.

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(Other definitions for wood that I've seen before include "Copse" , "'Under Milk - - ' (lit.)" , "deal?" , "Old conductor" , "celebrated conductor" .)

I've seen this clue in the Evening Standard.

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