To get a fortune, you need money to back (3)
I believe the answer is:
lot
'to get a fortune' is the definition.
I can't tell whether this defines the answer.
'money to back' is the wordplay.
'money' becomes 'l' (L can mean 'pounds').
'back' is a reversal indicator.
'to' reversed gives 'ot'.
'l'+'ot'='LOT'
'you need' is the link.
Can you help me to learn more?
(Other definitions for lot that I've seen before include "Destiny - auction item(s)" , "Where filming may take place" , "Destiny - biblical character - Polish national airline" , "Great amount" , "is to be knocked down" .)