Rickman of "Die Hard” (4)
I believe the answer is:
alan
'rickman of die hard' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alan that I've seen before include "A.A. Milne's first name" , "Boy" , "Sir -- Sugar (The Apprentice)" , "- Bennett, English actor, dramatist, writer" , "- Ayckbourn, English playwright" .)