Though foolish, he sounds more advanced (5)
I believe the answer is:
moron
'though foolish he sounds more advanced' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'though foolish he' is the wordplay.
'though foolish' becomes 'mo' (I can't justify this - if you can you should give a lot more credence to this answer).
'he' becomes 'ron' (short for Ronald).
'mo'+'ron'='MORON'
Can you help me to learn more?
(Other definitions for moron that I've seen before include "Cretin" , "Fool" , "Blockhead" , "Complete imbecile" , "Halfwit" .)