The most common and most likely answer to this crossword clue is the 6 plus 6 letter word MILTON KEYNES
I've seen this crossword clue in The Times
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More clues leading to the result MILTON KEYNES
- Poet expresses grief vocally in modern development
- Poet joins economist somewhere in Buckinghamshire
- In horror, one left disheartened by unfinished home in new town
- New town poet audibly laments
- Children’s author’s maintaining high speed, vital here in Bucks
- 12 put back into race, sure to skirt round northern town
- Old poet’s taken round important north-eastern town
- Lieutenant, foolish type losing head, occupies digs in town
- Poet and economist now in town
Buddy explains!

The straight part
We know that "somewhere in Buckinghamshire" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case somewhere in buckinghamshire = milton keynes.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.