Party rising in power in old Scandinavia (4)
I believe the answer is:
odin
'power in old scandinavia' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'party rising in' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'rising' shows that the letters should be reversed in order (going up in a down clue).
'do' written backwards gives 'od'.
'od'+'in'='ODIN'
Can you help me to learn more?
(Other definitions for odin that I've seen before include "who's worshipped" , "Legendary ruler" , "an all-powerful one" , "Mythological Norse god of war" , "In Scandinavian myth the supreme god and creator" .)