Regularly read idea from Norse folklore (4)
I believe the answer is:
edda
'norse folklore' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'regularly read idea' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'read'+'idea'='readidea'
The alternate letters of 'readidea' are 'EDDA'.
'from' is the link.
Can you help me to learn more?
(Other definitions for edda that I've seen before include "Old Icelandic book" , "Norse poem collection" , "series of stories" , "Old Scandinavian book of poetry, etc" , "book previously" .)