People from Denmark, moving first to middle range of mountains (5)
I believe the answer is:
andes
'range of mountains' is the definition.
(Andes is an example)
'people from denmark moving first to middle' is the wordplay.
'people from denmark moving' becomes 'and' (I can't explain this - if you can you should believe this answer much more).
'first' becomes 'best' (similar in meaning).
'to middle' says to take the centre.
The centre of 'best' is 'es'.
'and'+'es'='ANDES'
(Other definitions for andes that I've seen before include "Great S American mountains" , "The range of llamas?" , "A geographical feature" , "South American mountain system" , "Mounts" .)