Aconcagua's range (5)
I believe the answer is:
andes
'aconcagua's range' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for andes that I've seen before include "Aconcagua the highest in this range" , "Mountain range in South America" , "Danes in S American mountains" , "Great mountains of western S America" , "Mounts" .)