Crossword Genius

Reserve supply of sound money (5)

Ross

I believe the answer is:

cache

'reserve supply' is the definition.
(thesaurus)

'sound money' is the wordplay.
'sound' shows a homophone (sound like).
'money' becomes 'cash' (cash is a type of money).
'cash' sounds like 'CACHE'.

'of' is the link.

(Other definitions for cache that I've seen before include "(Place in) hidden store" , "Hidden store of things" , "Secret store, hoard" , "what things could be stored in" , "Concealed store" .)

I've seen this clue in The Globe and Mail.
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