"I'm sorry, Dave" speaker of sci-fi (3)
I believe the answer is:
hal
'i'm sorry dave speaker of sci-fi' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hal that I've seen before include "Henry (diminutive)" , "Falstaff's Prince; 2001 computer" , "future Henry V" , "Shakespeare's prince" , "Shakespeare's Prince_with Falstaff" .)