Fool's speech in production of Lear (8)
I believe the answer is:
'production of lear' is the definition.
(I've seen this in other clues)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for nonsense that I've seen before include "Language without meaning" , "Gobbledegook" , "rhubarb" , "Boloney, tosh" , "Bull" .)