River in Brazilian city, magnificent close to centre (3,6)
I believe the answer is:
rio grande
'river' is the definition.
(Rio Grande is an example)
'brazilian city magnificent close to centre' is the wordplay.
'brazilian city' becomes 'Rio' (Rio de Janeiro).
'magnificent' becomes 'grand' (I've seen this in another clue).
'close to' indicates one should take the final letters (the close/ending of).
The final letter of 'centre' is 'e'.
'rio'+'grand'+'e'='RIO GRANDE'
'in' is the link.
(Other definitions for rio grande that I've seen before include "Long river" , "River flowing between USA and Mexico" , "Mexico-USA border" , "US/Mexican border river" , "Great river bordering USA and Mexico" .)