In civic administration, he's not good (3)
I believe the answer is:
cad
'in civic administration he's not good' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'in civic administration he's' is the wordplay.
'in' indicates the answer is hidden within the clue.
'CAD' is hidden in the letters of 'civic administration he'.
Can you help me to learn more?
(Other definitions for cad that I've seen before include "designing software" , "Wretch" , "Dishonourable man of decadent sort" , "A rotten chap, no integrity" , "Rotter, bounder" .)