Copper ransacked store concealing money for buyer (8)
I believe the answer is:
customer
'buyer' is the definition.
(I've seen this before)
'copper ransacked store concealing money' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'ransacked' indicates an anagram.
'concealing' is an insertion indicator.
'money' becomes 'm' (abbreviation in economics).
'store' anagrammed gives 'stoer'.
'stoer' enclosing 'm' is 'stomer'.
'cu'+'stomer'='CUSTOMER'
'for' acts as a link.
(Other definitions for customer that I've seen before include "Patron" , "Person buying" , "The person who pays" , "Buyer of goods or services" , "Person paying for item or service" .)