There's a forest of it in Warwickshire (5)

I believe the answer is:

arden

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'there's a forest' is the definition.
(forest in Shakespeare's As You Like It)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for arden that I've seen before include "Wooded region of Warwickshire" , "Shakespearean forest" , "Wood in play" , "Warwickshire forest" , "Collection of trees" .)

I've seen this clue in the Evening Standard.

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