Scandinavian with manner so awkward (8)
I believe the answer is:
norseman
'scandinavian' is the definition.
(Norsemen were ancient Scandinavians)
'with manner so awkward' is the wordplay.
'with' is a charade indicator (letters next to each other).
'awkward' is an anagram indicator.
'manner'+'so' is 'mannerso'.
'mannerso' anagrammed gives 'NORSEMAN'.
(Other definitions for norseman that I've seen before include "one attacking north-east?" , "invader" , "Scandinavian" , "A viking, perhaps" .)