Shakespeare's mad king (4)

I believe the answer is:

lear

(Other definitions for lear that I've seen before include "hardly the 7 [NO NONSENSE] type!" , "tragic figure" , "See 27 Across" , "Playful king and writer of nonsense verse" , "Tragic Shakepearean king, for real" .)

I've seen this clue in the LA Times.

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