The most common and most likely answer to this crossword clue is the 6 letter word MASSIF
I've seen this crossword clue in Independent
M
A
S
S
I
F
More clues leading to the result MASSIF
- Jenny takes motorway around front of Frenchmountains
- Service provided in range
- High points of service provided
- Range of service provided
- State-provided range
- Service provided for Highlands
- Male beast and one female in mountainous plateau
- Service provided for Highland area
- Following one’s bloke up mountainous area
- Mountainous region, service an uncertainty
Buddy explains!

The straight part
We know that "mountainous plateau" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mountainous plateau = massif.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.
What does MASSIF mean?
MASSIF noun- A principal mountain mass.
- A block of the earth's crust bounded by faults or flexures and displaced as a unit without internal change; normally consists of gneisses and schists