Prepared money (5)
I believe the answer is:
ready
This clue is a double definition.
'prepared' is the first definition.
(similar in meaning)
'money' is the second definition.
(ready can informally mean cash)
(Other definitions for ready that I've seen before include "Prepared, willing" , "Willing (to do something), prepare" , "Cash; within reach" , "rough companion" , "Prompt and adequate" .)