Rickman who played Severus Snape (4)

I believe the answer is:

alan

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

I've seen this clue in The Wall Street Journal.

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