Good individual left (4)
I believe the answer is:
gone
'left' is the definition.
(go can mean to leave)
'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 "Absent" , "... saga of 2's civil war" , "Departed; used up" , "Departed or no longer available" , "No longer present" .)