David —, playwright whose stage works include Maydays and Pentecost (5)

I believe the answer is:

edgar

(Other definitions for edgar that I've seen before include "- Allan Poe, US writer" , "10th-cent. English king" , "- Rice Burroughs, US novelist" , "Grade (anag)" , "character in King Lear" .)

I've seen this clue in The Mirror.

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