Being good, he's able to get ahead (5)
I believe the answer is:
canon
'being good he's' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'able to get ahead' is the wordplay.
'able' becomes 'can'.
'to get' is a charade indicator (letters next to each other).
'ahead' becomes 'on' (synonyms).
'can'+'on'='CANON'
Can you help me to learn more?
(Other definitions for canon that I've seen before include "religious leader" , "General rule; clergyman" , "General rule; cleric" , "Round, general rule" , "Basic law or principle" .)