Gold turned up by characters regularly in Swiss banks (4)
I believe the answer is:
rows
'banks' is the definition.
(I've seen this before)
'gold turned up by characters regularly in swiss' is the wordplay.
'gold turned up by characters' becomes 'ro' (I am not sure about this - if you are sure you should believe this answer much more).
'regularly in' indicates alternate letters.
The alternate letters of 'swiss' are 'ws'.
'ro'+'ws'='ROWS'
Can you help me to learn more?
(Other definitions for rows that I've seen before include "Banks" , "Puts one's oar in" , "emotional exchanges" , "Uses oars" , "Quarrels; ranks" .)