Bird seen in region next to range of hills (9)
I believe the answer is:
partridge
'bird' is the definition.
(partridge is a kind of bird)
'region next to range of hills' is the wordplay.
'region' becomes 'part' ('part' can be a synonym of 'region').
'next to' says to put letters next to each other.
'range of hills' becomes 'ridge' (I've seen this before).
'part'+'ridge'='PARTRIDGE'
'seen in' is the link.
(Other definitions for partridge that I've seen before include "Peculiarly apt girder for the game bird" , "Widespread bird" , "Flier" , "Flighty type" , "Animal" .)