Money is spurned by saint (5)
I believe the answer is:
franc
'money' is the definition.
(I've seen this before)
'is spurned by saint' is the wordplay.
'spurned by' indicates named letters should be taken away.
'saint' becomes 'francis'.
'francis' with 'is' taken out is 'FRANC'.
(Other definitions for franc that I've seen before include "Swiss currency unit" , "Historic currency" , "European currency until the end of 2001" , "One hundred centimes in Benin" , "Former French currency" .)