Move freely over the mountains (5)
I believe the answer is:
range
This clue might be a double definition.
'move freely' is the first definition.
'range' can be an answer for 'move' (ranging is a kind of moving). I am not certain of the 'freely' bit.
'the mountains' is the second definition.
(range of mountains)
'over' acts as a link.
Can you help me to learn more?
(Other definitions for range that I've seen before include "Cooking appliance" , "Variation within limits" , "area for stock" , "Limit of effectiveness" , "Number of items in a series" .)