Relative from America in the money? (6)
I believe the answer is:
cousin
'relative' is the definition.
(I've seen this before)
'america in the money?' is the wordplay.
'america' becomes 'us' (abbreviation for the United States).
'in the' is an insertion indicator.
'money?' becomes 'coin' (I've seen this before).
'us' inserted inside 'coin' is 'COUSIN'.
'from' acts as a link.
(Other definitions for cousin that I've seen before include "Family relative" , "An aunt's or uncle's child" , "Son or daughter of an uncle or aunt" , "Aunt's/uncle's child" , "Kinsman, generally (archaic)" .)