Individual in the money (3)
I believe the answer is:
one
'individual' is the definition.
'in the money' is the wordplay.
'in' says the answer is hidden in the clue.
'ONE' is hidden within 'money'.
(Other definitions for one that I've seen before include "SECOND PART OF 16" , "This is singular" , "Unit" , "time" , "A certain; single person" .)