The most common and most likely answer to this crossword clue is the 9 letter word SNOWDONIA
I've seen this crossword clue in The Times
S
N
O
W
D
O
N
I
A
More clues leading to the result SNOWDONIA
- No word about one stuck in South America's mountain range
- Park on downs for a ramble, taking main road back
- Small wood in an unkempt national park
- Wind soon destroyed area in national park
- Mountainous region today with dead end stopping girl
- Range that’s fashionable to wear in country once shortened
- At the moment, assume one is in South American national park
- Highland photographer not working in Iona
- Two directions misinterpreted in a wood and mountainous area
- Stormy winds on bridges over a national park
Buddy explains!
The straight part
We know that "mountain range" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mountain range = snowdonia.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.