Patron cross about new charges (5)
I believe the answer is:
donor
'patron' is the definition.
(a patron provides financial support)
'cross about new charges' is the wordplay.
'cross' becomes 'door' (a door is a kind of cross).
'about new' becomes 'n' (common abbreviation eg NT for New Testament. I am not sure about the 'about' bit.).
'charges' is an insertion indicator (charge can mean to charge into something).
'door' enclosing 'n' is 'DONOR'.
Can you help me to learn more?
(Other definitions for donor that I've seen before include "One who gives, maybe blood" , "Maker of gift" , "One who gives something" , "One contributing" , "Benefactor, giver" .)