The most common and most likely answer to this crossword clue is the 5 letter word MACAU
I've seen this crossword clue in The Guardian
M
A
C
A
U
More clues leading to the result MACAU
- Once an island bird losing half its tail?
- British historian? Lay off this Chinese region!
- Part of China with tailless parrot for all to see
- Tail-less parrot visible to all in what was Portuguese territory
- Three leading characters from Cambridge set up a university somewhere in China
- Formerly Portuguese Scotsman gets gold
- Obama caucus withholding a region of China
- Scotsman gets gold in Àomén
- Pharma cautioned somewhat in this island
- Old Portuguese territory nearly came back to Australia
Buddy explains!

The straight part
We know that "Chinese region!" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case chinese region! = macau.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.