Behind time or deceased (4)
I believe the answer is:
late
I believe this clue is a double definition.
'behind time' is the first definition.
(I've seen this before)
'deceased' is the second definition.
(I've seen this in another clue)
(Other definitions for late that I've seen before include "Dead - tardy" , "Far into the night" , "Delayed; dead" , "Teal (anag.)" , "Having bought it" .)