Is there a forest of it in the Ardennes? (5)

I believe the answer is:

arden

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'ardennes?' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

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(Other definitions for arden that I've seen before include "The forest of --, setting for As You Like It" , "Playwright; Shakespeare's forest" , "Theatrical forest" , "Collection of trees" , "Wood in play" .)

I've seen this clue in the Evening Standard.

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