Enthusiast from Brazil, say (3)
I believe the answer is:
nut
I believe this clue is a double definition.
'enthusiast' is the first definition.
(nut can mean an enthusiast or fan)
'brazil say' is the second definition.
(brazil is a kind of nut)
'from' is the link.
(Other definitions for nut that I've seen before include "Bolt counterpart" , "Hard-headed person" , "One securing bolt" , "Food put in crackers" , "1A [CRACKPOT]?" .)