Furthest limit of fire in the mountains (5)
I believe the answer is:
range
This could be a double definition.
'furthest limit' is the first definition.
'range' can be an answer for 'limit' (I've seen this before). I'm unsure of the 'furthest' bit.
'fire in the mountains' is the second definition.
'range' can be an answer for 'mountains' (range of mountains). I am not sure about the 'fire in the' bit.
'of' is the link.
Can you help me to learn more?
(Other definitions for range that I've seen before include "Scope; chain" , "A set of different things of the same general type" , "Cooking stove or location for target practice" , "Limit of effectiveness" , "Old song: ''Home on the . . . . .''" .)