Climb the range (5)
I believe the answer is:
scale
I believe this clue is a double definition.
'climb' is the first definition.
(I know that scale is a more specific form of the action climb)
'the range' is the second definition.
(I've seen this before)
(Other definitions for scale that I've seen before include "Group of notes in ascending or descending order" , "Series of notes in an octave" , "range" , "Tones rising maybe" , "Climb; overlapping plate" .)