In raising money for nothing (3)
I believe the answer is:
nil
'nothing' is the definition.
(eg nil is zero in football)
'in raising money' is the wordplay.
'raising' shows that the letters should be reversed in order (in a down clue, letters go up).
'money' becomes 'l' (L can mean 'pounds').
'in' written backwards gives 'ni'.
'ni'+'l'='NIL'
'for' acts as a link.
(Other definitions for nil that I've seen before include "Nothing, zero" , "0" , "none" , "You get nothing" , "Zero, zilch" .)