Genuine Brazilian coin (4)
I believe the answer is:
real
I believe this clue is a double definition.
'genuine' is the first definition.
(associated in meaning)
'brazilian coin' is the second definition.
(I've seen this in another clue)
(Other definitions for real that I've seen before include "Certainly no counterfeit" , "The old coin actually exists" , "Physically existing" , "Actual, not imaginary" , "Existing, not imaginery" .)