He gets credit for nothing good (5)
I believe the answer is:
crook
'he' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'credit for nothing good' is the wordplay.
'credit' becomes 'cr' (abbreviation).
'for' means one lot of letters go next to another.
'nothing' becomes 'O' (O resembles 0).
'good' becomes 'ok'.
'cr'+'o'+'ok'='CROOK'
'gets' is the link.
Can you help me to learn more?
(Other definitions for crook that I've seen before include "Something kinky" , "Well, no" , "Professional criminal" , "Swindler - crosier - ill (in Australia)" , "Shepherd's staff" .)