A cunning ruse, on the quiet, concerning money (5)
I believe the answer is:
purse
'money' is the definition.
(a purse contains money)
'a cunning ruse on the quiet' is the wordplay.
'a cunning' is an anagram indicator.
'on' is a charade indicator (letters next to each other).
'the quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'ruse' with letters rearranged gives 'urse'.
'urse' after 'p' is 'PURSE'.
'concerning' acts as a link.
(Other definitions for purse that I've seen before include "Prize funds" , "Means < to close" , "amount of money" , "Handbag or money prize" , "Pocket" .)