National park in N-Nottingham? (3,6)

I believe the answer is:

new forest

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for new forest that I've seen before include "area of countryside?" , "Hampshire woodland" , "part of Hampshire" , "rural area" , "Wooded area of Hampshire" .)

I've seen this clue in The Independent.

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