Trees oft hewn in Hants? (3,3,6)

I believe the answer is:

the new forest

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'in hants?' is the definition.
(forest in Hampshire aka Hants)

'trees oft hewn' is the wordplay.
'trees oft hewn' anagrams to 'THE NEW FOREST'.
However, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Another definition for the new forest that I've seen is " in Hampshire?".)

I've seen this clue in The Guardian.

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