Departed behind time (4)
I believe the answer is:
late
I believe this clue is a double definition.
'departed' is the first definition.
(late can mean deceased)
'behind time' is the second definition.
(I've seen this before)
(Other definitions for late that I've seen before include "Teal (anag.)" , "Recently dead" , "Having bought it" , "Dead or not punctual" , "Behind schedule" .)