An advanced player (7)
I believe the answer is:
forward
This clue could be a double definition.
'an advanced' is the first definition.
(thesaurus)
'player' is the second definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
Can you help me to learn more?
(Other definitions for forward that I've seen before include "Straight ahead" , "Attacker" , "Pushy - send (on)" , "left-winger, maybe" , "advance" .)