King Edward, so erudite (7)
I believe the answer is:
learned
'erudite' is the definition.
('learned' can be a synonym of 'erudite')
'king edward' is the wordplay.
'king' becomes 'lear' (I've seen this before).
'edward' becomes 'ned'.
'lear'+'ned'='LEARNED'
'so' acts as a link.
(Other definitions for learned that I've seen before include "Acquired information, being well educated" , "Literati" , "Gained understanding" , "Absorbed information about Leander" , "Intellectual" .)