Incompetent celebrity (7)
I believe the answer is:
notable
This clue could be a double definition.
'incompetent' is the first definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'celebrity' is the second definition.
(notable can mean a famous person)
Can you help me to learn more?
(Other definitions for notable that I've seen before include "Prominent" , "Star" , "Impressive" , "Big noise" , "Worth remembering" .)