Accountant given hush money (4)
I believe the answer is:
cash
'money' is the definition.
(cash is a type of money)
'accountant given hush' is the wordplay.
'accountant' becomes 'CA' (abbreviation for chartered accountant).
'given' says to put letters next to each other.
'hush' becomes 'sh' (both are used to tell someone to be quiet).
'ca'+'sh'='CASH'
(Other definitions for cash that I've seen before include "Wimbledon champion" , "Singer Johnny, d. 2003" , "Till" , "Spondulicks" , "bread" .)