Cryptic crossword clue
Deer and rabbits seen in this English region briefly 15

The most common and most likely answer to this crossword clue is the 15 letter word BUCKINGHAMSHIRE

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "English region" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case english region = buckinghamshire.
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.

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