Mountains in cattle country (5)
I believe the answer is:
range
I believe this is a double definition.
'mountains' is the first definition.
(range of mountains)
'cattle country' is the second definition.
(I've seen this in another clue)
'in' acts as a link.
(Other definitions for range that I've seen before include "specific category" , "Breadth (of variation)" , "Take sides" , "Span" , "Open land for livestock in the US" .)