Astronaut Bean (4)
I believe the answer is:
alan
'astronaut bean' 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 "-- Turing, English computer scientist" , "A.A. Milne's first name" , "Lana (anag.), man's name" , "- Bates, - Bennett" , "English historian/poet" .)