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