Sphere of action in government I brought up (5)
I believe the answer is:
orbit
'sphere of action' is the definition.
(I've seen this before)
'in government i brought up' is the wordplay.
'in' indicates the answer is hidden within the clue.
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'tibro' is hidden within 'government i brought'.
'tibro' backwards is 'ORBIT'.
(Other definitions for orbit that I've seen before include "field of activity" , "astronauts' course" , "Rotating path" , "Circle - influence" , "Revolve around" .)