Brought up to talk about money in an informal way (4)
I believe the answer is:
bred
'brought up' is the definition.
(to breed is to bring up or raise)
'talk about money in an informal way' is the wordplay.
I cannot quite understand how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is present in the answer.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for bred that I've seen before include "did produce issue" , "Developed (animal variety)" , "Generated" , "Brought forth" , "Multiplied" .)