Departed well after time (4)
I believe the answer is:
late
This clue might be a double definition.
'departed well' is the first definition.
'late' can be an answer for 'departed' (late can mean deceased). I'm not certain of the 'well' bit.
'after time' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for late that I've seen before include "Dead or dilatory" , "Teal (anag.)" , "No longer alive; tardy" , "After the usual time" , "Overdue; dead" .)