Hoard money, we hear (5)
I believe the answer is:
cache
'hoard' is the definition.
(both can mean a stock of things)
'money we hear' is the wordplay.
'money' becomes 'cash' (cash is a type of money).
'we hear' indicates a 'sounds like' (homophone) clue.
'cash' sounds like 'CACHE'.
(Other definitions for cache that I've seen before include "Reserve" , "Collection of hidden things" , "Concealed store" , "Nest egg" , "Hiding place for treasure or store" .)