Money, nothing less - fortune? (3)
I believe the answer is:
lot
'fortune?' is the definition.
(as in a person's lot in life)
'money nothing less' is the wordplay.
'money' becomes 'l' (L can mean 'pounds').
'nothing less' becomes 'ot' (I can't justify this - if you can you should believe this answer much more).
'l'+'ot'='LOT'
(Other definitions for lot that I've seen before include "part of France?" , "Share - tons" , "Large amount at an auction" , "large quantity" , "Nephew of Abraham - batch" .)