"The Hairy Ape” writer (6)

I believe the answer is:

oneill

(Other definitions for oneill that I've seen before include "Eugene ..., Tip..., Ryan ... (1'5)" , "Eugene --, US dramatist" , "Eugene -, US playwright (The Iceman Cometh)" , "American dramatist" .)

I've seen this clue in the King Feature Syndicate.

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