Actor Ruck of HBO's "Succession"

I believe the answer is:

alan

(Other definitions for alan that I've seen before include "English name" , "Lana (anag.), man's name" , "-- Turing, English computer scientist" , "- Ayckbourn, English playwright" , "- Bennett, English actor, dramatist, writer" .)

I've seen this clue in The New York Times.

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