Prepared to pay cash (5)
I believe the answer is:
ready
This clue could be a double definition.
'prepared' is the first definition.
(similar in meaning)
'pay cash' is the second definition.
'ready' can be an answer for 'cash' (ready can informally refer to cash). I'm unsure of the 'pay' bit.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for ready that I've seen before include "Fully prepared" , "At hand" , "Waiting" , "Quick" , "Prepare money" .)