Secret store of money announced (5)
I believe the answer is:
cache
'secret store' is the definition.
(I've seen this before)
'money announced' is the wordplay.
'money' becomes 'cash' (I've seen this before).
'announced' indicates a 'sounds like' (homophone) clue.
'cash' is a homophone of 'CACHE'.
'of' acts as a link.
(Other definitions for cache that I've seen before include "Secret store of valuables" , "Hiding place for treasure etc" , "Collection of hidden things" , "Secret store, hoard" , "Secretly keep" .)