Being good, he always appears in correct order (6)
I believe the answer is:
rector
'being good he always' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'in correct order' is the wordplay.
'in' indicates a hidden word.
'RECTOR' is hidden in the letters of 'correct order'.
'appears' is the link.
Can you help me to learn more?
(Other definitions for rector that I've seen before include "Parson" , "Vicar" , "Parish priest" , "Type of clergyman" , "Church official" .)