The most common and most likely answer to this crossword clue is the 5 letter word OTAGO
O
T
A
G
O
More clues leading to the result OTAGO
- Series of books on past antipodean province
- Mark visiting loves Antipodean city
- Regularly visited portand NZ region
- Not a golfer’s place in New Zealand
- Rings circling label in NZ location
- Where kiwis are found using label held by rings
- Smallest thing I missed on journey in region down under
- New Zealand area identified in religious texts from the past
- Postman regularly avoided travel in Antipodean region
- Old volunteers work in region of South Island
Buddy explains!

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