Large-horned wild goat (4)
I believe the answer is:
ibex
'large-horned wild goat' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ibex that I've seen before include "being nimble-footed" , "Sure-footed type" , "Large-horned wild goat" , "Mountain-goat" , "Mountain goat with long curved horns" .)