Some S. American desperadoes in the mountains (5)
I believe the answer is:
andes
'the mountains' is the definition.
(I've seen this in another clue)
'some s american desperadoes' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ANDES' is hidden in the letters of 's american desperadoes'.
'in' is the link.
(Other definitions for andes that I've seen before include "A geographical feature" , "Great mountains of western S America" , "Major mountain range" , "The range of llamas?" , "South American mountain chain" .)