Mountain-related (6)
I believe the answer is:
alpine
'mountain-related' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alpine that I've seen before include "Relating to high mountains" , "from Germany, Austria etc" , "To do with great European mountains" , "Plant of high mountains" , "Nepali (anag.)" .)