Auditor's store for funds (4)
I believe the answer is:
cash
'funds' is the definition.
(I've seen this before)
'auditor's store' is the wordplay.
'auditor's' indicates a 'sounds like' (homophone) clue.
'store' becomes 'cache' (cache is a kind of store).
'cache' sounds like 'CASH'.
'for' is the link.
(Other definitions for cash that I've seen before include "bread" , "Wimbledon champion" , ""Readies"" , "Funds" , "Brass" .)