Defeat; bereavement (4)
I believe the answer is:
loss
This clue is a double definition.
'defeat' is the first definition.
(I've seen this before)
'bereavement' is the second definition.
(I've seen this in another clue)
(Other definitions for loss that I've seen before include "One may be missed" , "Bandleader" , "Defeat - deprivation" , "disappearance" , "Financial reverse" .)