Mexican district aside from Brazilian city (6)
I believe the answer is:
barrio
'mexican district' is the definition.
'barrio' can be an answer for 'district' (I have seen 'Spanish district' mean 'barrio' so perhaps 'district' could also mean 'barrio'). I am not certain of the 'mexican' bit.
'aside from brazilian city' is the wordplay.
'aside from' becomes 'bar' (I can't explain this - if you can you should believe this answer much more).
'brazilian city' becomes 'Rio' (Rio de Janeiro).
'bar'+'rio'='BARRIO'
Can you help me to learn more?
(Other definitions for barrio that I've seen before include "District in Spanish-speaking town or city" , "Spanish town district" , "Spanish area" , "Spanish-speaking quarter in a US town" , "Town's Spanish quarter" .)