More than one intended to invest new money (8)
I believe the answer is:
finances
'money' is the definition.
(thesaurus)
'more than one intended to invest new' is the wordplay.
'more than one intended' becomes 'fiances' (someone's intended is their fiance).
'to invest' is an insertion indicator (back).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'fiances' placed around 'n' is 'FINANCES'.
(Other definitions for finances that I've seen before include "Monetary resources" , "funds" , "Provides money for" , "Provides the capital" , "Assets in the form of money" .)