Scandinavian Odin with calmer exterior, curiously (6)
I believe the answer is:
nordic
'scandinavian' is the definition.
('Nordic' can be a synonym of 'scandinavian')
'odin with calmer exterior curiously' is the wordplay.
'with' is a charade indicator (letters next to each other).
'exterior' says to hollow out the word (remove centre letters).
'curiously' is an anagram indicator.
'calmer' with its middle removed is 'cr'.
'odin' after 'cr' is 'crodin'.
'crodin' is an anagram of 'NORDIC'.
(Other definitions for nordic that I've seen before include "Relating to Scandinavian language" , "Relating to tall fair people of N Germany" , "Of tall, fair Germanic people" , "characters are tall and blond" , "Relating to Scandinavia, Finland and Iceland" .)