Feature about royal, Scandinavian (5)
I believe the answer is:
norse
'scandinavian' is the definition.
(Norse can mean relating to ancient Scandinavia)
'feature about royal' is the wordplay.
'feature' becomes 'nose' (a facial feature).
'about' is an insertion indicator.
'royal' becomes 'r' (common abbreviation e.g. RM - Royal Marine).
'nose' going around 'r' is 'NORSE'.
(Other definitions for norse that I've seen before include "Old European" , "Native to Norway" , "Language - senor! (anag)" , "Ancient Scandinavian language" , "Of old Scandinavia" .)