Regan's regal father (4)

I believe the answer is:

lear

(Other definitions for lear that I've seen before include "Tragic Shakespearean king" , "Tragic character" , "Humorist, Edward --" , "Tragic Shakepearean king, for real" , "Tragic Shakespearian king" .)

I've seen this clue in the Universal and The Washington Post.

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