Anybody in the money (3)
I believe the answer is:
one
'anybody' is the definition.
(I've seen this in another clue)
'in the money' is the wordplay.
'in' indicates a hidden word.
'ONE' can be found hidden inside 'money'.
(Other definitions for one that I've seen before include "Hour after midnight" , "Single, sole" , "both halves" , "Single and undivided" , "I can mean this" .)