Viking feature has registered (5)
I believe the answer is:
norse
'viking' is the definition.
(the Vikings were a Norse people)
'feature has registered' is the wordplay.
'feature' becomes 'nose' (a facial feature).
'has' is an insertion indicator.
'registered' becomes 'R' (abbreviation, as in registered trademark).
'nose' placed around 'r' is 'NORSE'.
(Other definitions for norse that I've seen before include "Native to Scandinavia" , "Family of Germanic languages spoken in Scandinavia and Iceland" , "Ancient Scandinavian language" , "Relating to Norway" , "Northern European" .)