Good individual no longer with us (4)
I believe the answer is:
gone
'no longer with us' is the definition.
(I've seen this in another clue)
'good individual' is the wordplay.
'good' becomes 'g' (abbreviation).
'individual' becomes 'one' (an individual is one person).
'g'+'one'='GONE'
(Other definitions for gone that I've seen before include "Departed or dead" , "No longer present" , "Absent" , "Departed, disappeared" , "Moved - died" .)