River in the garden (4)

I believe the answer is:

eden

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'garden' is the definition.
(Garden of Eden in the Bible)

I don't understand how the remainder of the clue works.

(Other definitions for eden that I've seen before include "Old Testament garden" , "Someone once seen in Number Ten's" , "The first garden" , "The near-perfect garden" , "Idyllic garden" .)

I've seen this clue in the Evening Standard.

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