Well known not to be Edwardian (5)
I believe the answer is:
noted
'well known' is the definition.
(I've seen this in another clue)
'not to be edwardian' is the wordplay.
'to be edwardian' becomes 'ed' (I am not sure about this - if you are sure you should believe this answer much more).
'not'+'ed'='NOTED'
Can you help me to learn more?
(Other definitions for noted that I've seen before include "Widely known and esteemed" , "Recorded in writing" , "Celebrity" , "written down" , "Toned (anag.)" .)