Supporter has complaint about new player (10)
I believe the answer is:
benefactor
'supporter' is the 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?
'complaint about new player' is the wordplay.
I cannot quite understand how this works, but
'about' could be 'c' (abbreviation for 'circa') and 'c' is found within the answer.
'new' could be 'n' and 'n' is found in the answer.
'complaint' could be 'beef' (I've seen this before) and 'beef' is present in the leftover letters.
This may be the basis of clue (or it may be nonsense).
'has' is the link.
Can you help me to learn more?
(Other definitions for benefactor that I've seen before include "Patronising sort" , "One financially supporting a worthy cause" , "Donor to a good cause" , "Person giving to a good cause" , "charity supporter?" .)