The most common and most likely answer to this crossword clue is the 9 letter word HIMALAYAN
I've seen this crossword clue in The Guardian
H
I
M
A
L
A
Y
A
N
More clues leading to the result HIMALAYAN
- One from a huge range of greetings from Kuala Lumpur?
- Greeting Asian from Peak District?
- Cat may be animal hard to catch indeed
- Greeting Asian national at the highest level
- That fellow coming from part of SE Asia, avoiding mass of mountains
- The Queen has introduced one over a year in a network of vast range
- Greeting in Asian language, for one on the mountain range
- Greeting KL native of great height
- Munching hay, animal in high-up region
- That man, in the manner of French, offered up refusal, high and mighty
Buddy explains!

The straight part
We know that "in high-up region" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in high-up region = himalayan.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.