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 can't explain this - if you can you should believe this answer much more).
'and' means one lot of letters go next to another.
'originally' suggests taking the first letters.
The initial 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" .)