Too far away from the mountains? (3,2,5)
I believe the answer is:
out of range
'too far away' is the definition.
(I've seen this before)
'from the mountains?' is the wordplay.
'from' becomes 'out of' (I've seen this in another clue).
'the mountains?' becomes 'range' (range of mountains).
'outof'+'range'='OUT OF RANGE'
(Other definitions for out of range that I've seen before include "Too far away" , "from the Pennines, say?" .)