Keep mum after chartered accountant produces the money (4)
I believe the answer is:
cash
'the money' is the definition.
(cash is a type of money)
'keep mum after chartered accountant' is the wordplay.
'keep mum' becomes 'sh' (both are ways of telling someone to be quiet).
'after' means one lot of letters go next to another.
'chartered accountant' becomes 'CA' (abbreviation for chartered accountant).
'sh' after 'ca' is 'CASH'.
'produces' is the link.
(Other definitions for cash that I've seen before include "notes, perhaps?" , "Hard currency" , "Ready money" , "Money in the form of notes and coins" , "bread" .)