Crossword Genius

Fool's speech in production of Lear (8)


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'production of lear' is the definition.
(I've seen this in other clues)

I don't understand the remainder of the clue.

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(Other definitions for nonsense that I've seen before include "Language without meaning" , "Gobbledegook" , "rhubarb" , "Boloney, tosh" , "Bull" .)

I've seen this clue in The Globe and Mail.
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