He wrote "ladlecum", "enkoopia", "attery" and "runcible" originally (4)
I believe the answer is:
lear
'he wrote ladlecum enkoopia' is the definition.
The definition suggests a singular noun which matches the answer.
'attery and runcible originally' is the wordplay.
'attery' becomes 'lea' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' says to put letters next to each other.
'originally' indicates taking the first letters.
The first letter of 'runcible' is 'r'.
'lea'+'r'='LEAR'
Can you help me to learn more?
(Other definitions for lear that I've seen before include "tragic figure" , "Edward, writer of nonsense verse" , "Humorist, Edward --" , "Tragic Shakespeare king - quite real" , "troubled king" .)