Some Alpine climbers (6)
I believe the answer is:
ibexes
'some alpine climbers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ibexes that I've seen before include "Wild mountain goats with backward-curving horns" , "Large wild goats" , "Large mountain goats" , "Mountain-dwellers" , "Wild mountain goats with beards" .)