Hunter working outside city in Brazil (5)
I believe the answer is:
orion
'hunter' is the definition.
(constellation)
'working outside city in brazil' is the wordplay.
'working' becomes 'on' (on can mean working or activated).
'outside' means one lot of letters goes inside another.
'city in brazil' becomes 'rio' (I can't explain this - if you can you should give a lot more credence to this answer).
'on' going around 'rio' is 'ORION'.
Can you help me to learn more?
(Other definitions for orion that I've seen before include "Mythical Greek hunter turned into constellation" , "Prominent constellation" , "Group in heaven" , "Constellation in the form of a belt" , "Rigel constellation" .)