Change Roman coin in Switzerland (4)
I believe the answer is:
cash
'change' is the definition.
(cashing is a kind of changing)
'roman coin in switzerland' is the wordplay.
'roman coin' becomes 'as' (I can't justify this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'switzerland' becomes 'ch'.
'as' put inside 'ch' is 'CASH'.
Can you help me to learn more?
(Other definitions for cash that I've seen before include "notes, perhaps?" , "Till" , "Wimbledon champion" , "Singer Johnny, d. 2003" , "Brass" .)