Many refuse ready money (4)
I believe the answer is:
cash
'ready money' is the definition.
(I've seen this before)
'many refuse' is the wordplay.
'many' becomes 'c' (C is the Roman numeral for 100).
'refuse' becomes 'ash' (I've seen this in other clues).
'c'+'ash'='CASH'
(Other definitions for cash that I've seen before include "Spondulicks" , "Funds" , "Brass" , "Hard currency" , "Wimbledon champion" .)