Saintly man is left money in Swiss banks (5)
I believe the answer is:
franc
'money in swiss banks' is the definition.
'franc' can be an answer for 'money' (former currency of France). I am unsure of the 'in swiss banks' bit.
'saintly man is left' is the wordplay.
I cannot really see how this works, but
'man' could be 'fran' and 'fran' is found within the answer.
A single letter 'c' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for franc that I've seen before include "I'm accepted in Basle" , "Swiss monetary unit" , "It's ready" , "Old French currency" , "Old French money" .)