Visible in Finland, Estonian mountain range (5)
I believe the answer is:
andes
'mountain range' is the definition.
(Andes is an example)
'visible in finland estonian' is the wordplay.
'visible in' indicates a hidden word.
'ANDES' can be found hidden inside 'finland estonian'.
(Other definitions for andes that I've seen before include "Great mountains of western S America" , "Mountain range in South America" , "World's longest mountain range" , "Danes seen in mountains" , "South American mountain chain" .)