Viking language (5)
I believe the answer is:
norse
'viking language' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for norse that I've seen before include "Old Scandinavian tongue" , "like the Valkyries?" , "Family of Germanic languages spoken in Scandinavia and Iceland" , "Native to Norway" , "Relating to ancient Scandinavian" .)